update readme and compose file for multi platform

Author: a-mnich

README.md

@@ -11,7 +11,7 @@ This repository contains the scripts that build the ContainerSSH container image
 
 This repository contains a build script in Go called `build.go`. It can be invoked by running `go run build.go`. This script will read [build.yaml](build.yaml) and build the container image based on that revision. It uses the GitHub API to download release artifacts, so it may need the `GITHUB_TOKEN` environment variable set. The optional `--push` flag can be set to push the images to the corresponding registries.
 
-Under the hood the build uses [`docker-compose`](https://docs.docker.com/compose/) to build, test, and push the images. The build steps can be performed manually.
+Under the hood the build uses [`docker compose`](https://docs.docker.com/compose/) to build, test, and push the images. The build steps can be performed manually.
 
 Before you begin you must set several environment variables. These are the following:
 
@@ -26,15 +26,15 @@ Before you begin you must set several environment variables. These are the follo
 For example, on Linux/MacOS:
 
 ```bash
-CONTAINERSSH_VERSION="0.3.1"
-CONTAINERSSH_TAG="0.3.1"
+CONTAINERSSH_VERSION="v0.5.2"
+CONTAINERSSH_TAG="v0.5.2"
 ```
 
 On Windows/PowerShell:
 
 ```ps1
-$env:CONTAINERSSH_VERSION="0.3.1"
-$env:CONTAINERSSH_TAG="0.3.1"
+$env:CONTAINERSSH_VERSION="v0.5.2"
+$env:CONTAINERSSH_TAG="v0.5.2"
 ```
 
 ### Build
@@ -44,29 +44,29 @@ The build step requires build arguments to function. At the very least it should
 Optionally, you can also specify a `GITHUB_TOKEN` to work around GitHub rate limits and `SOURCE_REPO` to point the build to a different source URL.
 
 ```bash
-docker-compose build
+docker compose build
 ``` 
 
 ### Test
 
 Testing is done via a container called `sut`. This container will wait for ContainerSSH to come up and then run a simple SSH connection to it to test that it works correctly. This is not a comprehensive test, but checks if the image build was successful.
 
 ```
-docker-compose up --abort-on-container-exit --exit-code-from=sut
+docker compose up --abort-on-container-exit --exit-code-from=sut
 ```
 
 ### Clean up after test
 
 ```
-docker-compose down
+docker compose down
 ```
 
 ### Push
 
-Finally, pushing container images can also be done from `docker-compose`. After a `docker login` command this can be simply done using the following command:
+Finally, pushing container images can also be done from `docker compose`. After a `docker login` command this can be simply done using the following command:
 
 ```
-docker-compose push
+docker compose push
 ```
 
 ## Versioning

docker-compose.yaml

@@ -1,10 +1,12 @@
 ---
-version: '3.9'
 services:
   containerssh:
     image: ${REGISTRY:-}containerssh/containerssh:${CONTAINERSSH_TAG:?CONTAINERSSH_TAG variable must be set}
     build:
       context: containerssh
+      platforms:
+        - "linux/amd64"
+        - "linux/arm64"
       args:
         CONTAINERSSH_VERSION: ${CONTAINERSSH_VERSION:?CONTAINERSSH_VERSION variable must be set.}
         GITHUB_TOKEN: ${GITHUB_TOKEN:-}
@@ -29,6 +31,9 @@ services:
     image: ${REGISTRY:-}containerssh/containerssh-test-authconfig:${CONTAINERSSH_TAG:?CONTAINERSSH_TAG variable must be set}
     build:
       context: containerssh-test-authconfig
+      platforms:
+        - "linux/amd64"
+        - "linux/arm64"
       args:
         CONTAINERSSH_VERSION: ${CONTAINERSSH_VERSION:?CONTAINERSSH_VERSION variable must be set.}
         GITHUB_TOKEN: ${GITHUB_TOKEN:-}