add platforms input

Signed-off-by: Andreas Heinrich <[email protected]>

.github/workflows/deploy-single-docker-image.yml

@@ -29,6 +29,13 @@ on:
         description: 'Forces rebuild of docker image, even if no changes are detected'
         default: false
         type: boolean
+      platforms:
+        description: 'Platforms to build for'
+        default: |
+          linux/amd64
+          linux/arm64
+          linux/arm/v7'
+        type: string
     secrets:
       SA_GITHUB_PAT:
         description: 'Github PAT with access to the repository'
@@ -83,6 +90,14 @@ jobs:
           echo "No Dockerfile found for image ${{ inputs.image_name }}!"
           exit 1
         fi
+    - name: Parse platforms
+      id: parse-platforms
+      run: |
+        # remove all empty lines
+        result=$(echo "${{ inputs.platforms }}" | sed '/^$/d')
+        # replace newlines with commas, remove trailing comma
+        result=$(echo "${result}" | tr '\n' ',' | sed 's/,$//')
+        echo "platforms=${result}" >> $GITHUB_OUTPUT
     - name: Extract metadata
       id: meta
       uses: docker/metadata-action@v3
@@ -109,6 +124,6 @@ jobs:
         push: true
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}    
-        platforms: linux/amd64,linux/arm64,linux/arm/v7
+        platforms: ${{ steps.parse-platforms.outputs.platforms }}
         cache-from: type=gha
         cache-to: type=gha,mode=max