fix: use colon separators

Author: laurentsenta

.github/actions/extract-fixtures/action.yml

@@ -25,4 +25,5 @@ runs:
         ref: ${{ steps.github.outputs.action_sha || steps.github.outputs.action_ref }}
         dockerfile: Dockerfile
         args: extract-fixtures --directory="$OUTPUT" --merged="$MERGED"
-        build-args: --build-arg VERSION=${{ steps.github.outputs.action_ref }}
+        build-args: |
+          VERSION:${{ steps.github.outputs.action_ref }}

.github/actions/test/action.yml

@@ -46,7 +46,8 @@ runs:
         dockerfile: Dockerfile
         opts: --network=host
         args: test --url="$URL" --json="$JSON" --specs="$SPECS" --subdomain-url="$SUBDOMAIN" -- ${{ inputs.args }}
-        build-args: --build-arg VERSION=${{ steps.github.outputs.action_ref }}
+        build-args: |
+          VERSION:${{ steps.github.outputs.action_ref }}
     - name: Create the XML
       if: (inputs.xml || inputs.html || inputs.markdown) && (failure() || success())
       uses: pl-strflt/gotest-json-to-junit-xml@v1