initial commit

README.md

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+# Dockerfile test build
+
+```yaml
+name: Docker Build CI
+on: [ push ]
+
+env:
+  BUILDKIT_VERSION: 'v0.29.0'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/cache@v4
+        with:
+          path: /var/lib/buildkit
+          key: ${{ runner.os }}-buildkit-${{ env.BUILDKIT_VERSION }}
+      - uses: https://git.klemek.fr/klemek/dockerfile-test-build@v1
+        with:
+          buildkit_version: ${{ env.BUILDKIT_VERSION }}
+```

action.yml

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+name: 'Dockerfile test build'
+description: 'Test build of Dockerfile'
+inputs:
+  dockerfile:
+    description: 'Dockerfile name'
+    required: true
+    default: '.'
+  context:
+    description: 'Build context'
+    required: true
+    default: '.'
+  buildkit_version:
+    description: 'Buildkit version'
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - name: Prepare buildkit directory
+      shell: bash
+      run: mkdir -p /var/lib/buildkit
+
+    - name: Download buildkit binaries
+      shell: bash
+      run: |
+        wget -nc -O /var/lib/buildkit/buildkit.tar.gz \
+          https://github.com/moby/buildkit/releases/download/${{ inputs.buildkit_version }}/buildkit-${{ inputs.buildkit_version }}.linux-amd64.tar.gz
+
+    - name: Extract buildkit binaries
+      shell: bash
+      run: tar -xf /var/lib/buildkit/buildkit.tar.gz -C /var/lib/buildkit
+
+    - name: Run buildkit build
+      shell: bash
+      run: |
+        /var/lib/buildkit/bin/buildkitd & \
+        while [ ! -f /run/buildkit/buildkitd.sock ]; do sleep 0.1; done && \
+        /var/lib/buildkit/bin/buildctl build \
+            --frontend=dockerfile.v0 \
+            --local context=${{ inputs.context }} \
+            --local dockerfile=${{ inputs.dockerfile }}