ci: unify all workflows

.github/actions/ensure-docker-image/action.yaml

@@ -0,0 +1,83 @@
+name: "Ensure docker image"
+description:
+  "Checks if image with specific tag exists in the github container registry.
+  If it does not exists builds and pushes it."
+
+inputs:
+  gh-token:
+    description: "Github token used to push the image"
+    required: true
+    default: ""
+
+  registry:
+    description: "Github registry"
+    required: true
+    default: "ghcr.io"
+
+  repository:
+    description: "Github repository"
+    required: true
+    default: "${{ github.repository }}"
+
+  image-name:
+    description: "Image name"
+    required: true
+    default: ""
+
+  image-tag:
+    description: "Image tag"
+    required: true
+    default: ""
+
+  dockerfile:
+    description: "Dockerfile path"
+    required: true
+    default: ""
+
+outputs:
+  tag:
+    description: "The latest tag which should be used"
+    value: ${{ steps.tag.outputs.tag }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Check if image exists
+      shell: bash
+      run: |-
+        if docker manifest inspect ${{ inputs.registry }}/${{ inputs.repository }}/${{ inputs.image-name }}:${{ inputs.image-tag }} > /dev/null 2>&1; then
+          echo "Image exists. Skipping build & push steps."
+          echo "exists=true" >> $GITHUB_ENV
+        else
+          echo "exists=false" >> $GITHUB_ENV
+        fi
+
+    - name: Checkout code
+      if: env.exists != 'true'
+      uses: actions/checkout@v4
+
+    - name: Set up Docker Buildx
+      if: env.exists != 'true'
+      uses: docker/setup-buildx-action@v3
+
+    - name: Log in to GitHub Container registry
+      if: env.exists != 'true'
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ inputs.registry }}
+        username: ${{ github.actor }}
+        password: ${{ inputs.gh-token}}
+
+    - name: Build and push Docker image
+      if: env.exists != 'true'
+      uses: docker/build-push-action@v6
+      with:
+        context: .
+        file: ${{ inputs.dockerfile }}
+        push: true
+        tags: ${{ inputs.registry }}/${{ inputs.repository }}/${{ inputs.image-name }}:${{ inputs.image-tag }}
+
+    - name: Latest tag output
+      id: tag
+      shell: bash
+      run: echo "tag=${{ inputs.image-tag }}" >> $GITHUB_OUTPUT