diff --git a/.github/workflows/rainbow-deployment.yml b/.github/workflows/rainbow-deployment.yml
new file mode 100644
index 0000000000..0a74c9229c
--- /dev/null
+++ b/.github/workflows/rainbow-deployment.yml
@@ -0,0 +1,114 @@
+name: Rainbow deployment (WIP)
+
+on:
+  pull_request:
+    branches:
+      - main
+      - feature/*
+    types:
+      - labeled
+      - opened
+      - reopened
+      - synchronize
+
+env:
+  AWS_ACCOUNT_ID: ${{ vars.STAGING_AWS_ACCOUNT_ID }}
+  AWS_REGION: ca-central-1
+  GITHUB_SHA: ${{ github.sha }}
+  REGISTRY: ${{ vars.STAGING_AWS_ACCOUNT_ID }}.dkr.ecr.ca-central-1.amazonaws.com
+  COGNITO_APP_CLIENT_ID: ${{secrets.STAGING_COGNITO_APP_CLIENT_ID}}
+  COGNITO_USER_POOL_ID: ${{ secrets.STAGING_COGNITO_USER_POOL_ID}}
+  NEXT_SERVER_ACTIONS_ENCRYPTION_KEY: ${{ secrets.STAGING_NEXT_SERVER_ACTIONS_ENCRYPTION_KEY }}
+  ROLE_ARN: arn:aws:iam::${{ vars.STAGING_AWS_ACCOUNT_ID }}:role/forms-lambda-client
+  LISTENER_ARN: arn:aws:elasticloadbalancing:ca-central-1:${{ vars.STAGING_AWS_ACCOUNT_ID }}:listener/app/form-viewer/5e6bc2d9ab810b68/028e8eeeed9c3a34
+
+permissions:
+  id-token: write
+  contents: write
+  pull-requests: write
+
+jobs:
+  rainbow-deployment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          fetch-depth: 0
+
+      # - name: Get second to last release commit identifier
+      #   id: get-second-to-last-release
+      #   shell: bash
+      #   run: echo "commit-id=$(git rev-parse @~)" >> $GITHUB_OUTPUT
+
+      # - name: Checkout
+      #   uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      #   with:
+      #     ref: ${{ steps.get-second-to-last-release.outputs.commit-id }}
+
+      - name: Configure AWS credentials using OIDC
+        uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502 # v4.0.2
+        with:
+          role-to-assume: arn:aws:iam::${{ env.AWS_ACCOUNT_ID }}:role/platform-forms-client-pr-review-env
+          role-session-name: RainbowDeployment
+          aws-region: ${{ env.AWS_REGION }}
+
+      - name: Login to Staging Amazon ECR
+        id: login-ecr-staging
+        uses: aws-actions/amazon-ecr-login@062b18b96a7aff071d4dc91bc00c4c1a7945b076 # v2.0.1
+
+      # BASE_IMAGE should use the ECS image built for the previous release
+      # NEXT_DEPLOYMENT_ID should use right deployment identifier based on whether we are in Staging (git sha) or Production (git tag)
+      - name: Build Rainbow Lambda image
+        run: |
+          docker build -t rainbow \
+            -f Dockerfile.rainbow \
+            --build-arg BASE_IMAGE=$REGISTRY/forms_app_legacy:ecs \
+            --build-arg COGNITO_APP_CLIENT_ID=$COGNITO_APP_CLIENT_ID \
+            --build-arg COGNITO_USER_POOL_ID=$COGNITO_USER_POOL_ID \
+            --build-arg NEXT_DEPLOYMENT_ID=$GITHUB_SHA .
+
+      - name: Tag and Push Rainbow Lambda image
+        run: |
+          docker tag rainbow $REGISTRY/forms_app_legacy:$GITHUB_SHA
+          docker push $REGISTRY/forms_app_legacy:$GITHUB_SHA
+
+      # Could be divided in multiple steps
+      # For "aws elbv2 create-target-group" there is a limitation name size (32 characters max)
+      # For "aws elbv2 create-rule" we need to find a solution to deal with priority since rules can't have the same one
+      # For "aws elbv2 create-rule", if possible, we need to find a way to dynamically pass the right host header value
+      - name: Rainbow magic
+        run: |
+          lambdaArn=$(aws lambda create-function \
+            --function-name rainbow-$GITHUB_SHA \
+            --package-type Image \
+            --role $ROLE_ARN \
+            --timeout 15 \
+            --memory-size 2048 \
+            --code ImageUri=$REGISTRY/forms_app_legacy:$GITHUB_SHA \
+            --vpc-config SubnetIds=${{ secrets.PR_REVIEW_ENV_SUBNET_IDS }},SecurityGroupIds=${{ secrets.PR_REVIEW_ENV_SECURITY_GROUP_IDS }} | jq -r ".FunctionArn")
+
+          aws lambda wait function-active --function-name rainbow-$GITHUB_SHA
+
+          ./bin/set-rainbow-lambda-env-vars.sh rainbow-$GITHUB_SHA > /dev/null 2>&1
+
+          aws lambda add-permission \
+            --function-name rainbow-$GITHUB_SHA \
+            --statement-id rainbow-elb-invoke-permission \
+            --principal elasticloadbalancing.amazonaws.com \
+            --action lambda:InvokeFunction > /dev/null 2>&1
+
+          targetGroupArn=$(aws elbv2 create-target-group \
+            --name rainbow-${GITHUB_SHA:0:24} \
+            --target-type lambda | jq -r ".TargetGroups[0].TargetGroupArn")
+
+          aws elbv2 register-targets \
+            --target-group-arn $targetGroupArn \
+            --targets Id=$lambdaArn
+
+          aws elbv2 create-rule \
+            --listener-arn $LISTENER_ARN \
+            --conditions "[{\"Field\":\"host-header\",\"Values\":[\"forms-staging.cdssandbox.xyz\"]},{\"Field\":\"http-header\",\"HttpHeaderConfig\":{\"HttpHeaderName\":\"x-deployment-id\",\"Values\":[\"$GITHUB_SHA\"]}}]" \
+            --priority 1 \
+            --actions Type=forward,TargetGroupArn=$targetGroupArn \
+            --tags Key=Name,Value=rainbow-$GITHUB_SHA > /dev/null 2>&1
\ No newline at end of file
diff --git a/Dockerfile.rainbow b/Dockerfile.rainbow
new file mode 100755
index 0000000000..cc9a508e88
--- /dev/null
+++ b/Dockerfile.rainbow
@@ -0,0 +1,41 @@
+ARG BASE_IMAGE
+FROM $BASE_IMAGE as base
+
+FROM node:22-alpine as final
+LABEL maintainer="-"
+
+ARG COGNITO_APP_CLIENT_ID
+ENV COGNITO_APP_CLIENT_ID=$COGNITO_APP_CLIENT_ID
+
+ARG COGNITO_USER_POOL_ID
+ENV COGNITO_USER_POOL_ID=$COGNITO_USER_POOL_ID
+
+ARG INDEX_SITE="false"
+ENV INDEX_SITE=$INDEX_SITE
+
+ARG NEXT_DEPLOYMENT_ID
+ENV NEXT_DEPLOYMENT_ID=$NEXT_DEPLOYMENT_ID
+
+ENV AWS_LWA_ENABLE_COMPRESSION=true
+ENV HOSTNAME=localhost
+ENV PORT=3000
+
+# Use the LAMBDA_ENV environment variable to determine if the app is running in a Lambda environment
+# Enables memory caching for the prerendering of pages
+ENV LAMBDA_ENV=1
+
+WORKDIR /src
+
+COPY --from=base /src/.next/standalone ./
+COPY --from=base /src/.next/static ./.next/static
+
+# Lambda web adapter: https://github.com/awslabs/aws-lambda-web-adapter
+# The public.ecr.aws/awsguru/aws-lambda-adapter:0.7.0 image reference in the docs has
+# been pushed to the public CDS ECR to avoid rate limiting when pulling the image.
+COPY --from=public.ecr.aws/cds-snc/aws-lambda-adapter:0.7.0@sha256:00b1441858fb3f4ce3d67882ef6153bacf8ff4bb8bf271750c133667202926af /lambda-adapter /opt/extensions/lambda-adapter
+
+RUN ln -s /tmp ./.next/cache
+
+EXPOSE 3000
+
+ENTRYPOINT [ "node", "server.js"]
\ No newline at end of file
diff --git a/bin/set-rainbow-lambda-env-vars.sh b/bin/set-rainbow-lambda-env-vars.sh
new file mode 100755
index 0000000000..e8379c22c0
--- /dev/null
+++ b/bin/set-rainbow-lambda-env-vars.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -euo pipefail
+
+LAMBDA_FUNCTION_NAME=$1
+
+TASK_ARN="$(aws ecs list-tasks --cluster Forms --service-name form-viewer --output text --query 'taskArns[0]')"
+TASK_DEF_ARN="$(aws ecs describe-tasks --cluster Forms --task "$TASK_ARN" --output text --query 'tasks[0].taskDefinitionArn')"
+TASK_DEF="$(aws ecs describe-task-definition --task-definition "$TASK_DEF_ARN")"
+
+# Get environment variables from current task definition
+ENV_VARS=$(echo "$TASK_DEF" | jq -r '.taskDefinition.containerDefinitions[0].environment | map("\(.name)=\(.value)") | join(",")')
+
+# Get secrets from current task definition
+SECRET_VARS="$(echo "$TASK_DEF" | jq -r '.taskDefinition.containerDefinitions[0].secrets | flatten[] | [.name,.valueFrom] | join("=")')"
+while IFS= read -r SECRET; do
+    SECRET_NAME="${SECRET%%=*}"
+    SECRET_ARN="${SECRET#*=}"
+    SECRET_VALUE="$(aws secretsmanager get-secret-value --secret-id "$SECRET_ARN" --query 'SecretString' --output text)"
+    ENV_VARS="$ENV_VARS"$','"$SECRET_NAME=$SECRET_VALUE"
+done <<< "$SECRET_VARS"
+
+# Set Lambda environment variables
+LAMBDA_ENV_VARS="$(echo "$ENV_VARS" | sort | sed -e "s/{/'{/" -e "s/}/}'/")"
+aws lambda update-function-configuration --function-name $LAMBDA_FUNCTION_NAME --environment "Variables={$LAMBDA_ENV_VARS}" > /dev/null 2>&1
\ No newline at end of file