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.gitea/workflows/docker-build.yaml

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+---
+name: Docker Build
+on:
+  workflow_call:
+    inputs:
+      dockerfile:
+        description: 'Path to Dockerfile'
+        required: true
+        type: string
+      context:
+        description: 'Build context'
+        default: '.'
+        required: false
+      image:
+        description: 'Where to store the built image'
+        required: true
+        type: string
+      submodules:
+        description: 'Submodules pull strategy'
+        default: 'recursive'
+        required: false
+        type: string
+      user:
+        description: 'Git user for checkout'
+        default: 'automation'
+        required: false
+        type: string
+      token:
+        description: 'Git token for checkout'
+        required: true
+        type: string
+    outputs:
+      tag: 
+        description: 'Built image tag'
+        value: ${{ steps.build.outputs.tag }}
+      image:
+        description: 'Built image name'
+        value: ${{ steps.build.outputs.image }}
+      sha:
+        description: 'Git SHA used for the build'
+        value: ${{ steps.build.outputs.sha }}
+jobs:
+  build:
+    name: Build Docker Image
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+        with:
+          submodules: ${{ inputs.submodules }}
+          token: "${{ inputs.token }}"
+      - name: Gather registry metadata
+        uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ${{ inputs.image }}
+          tags: |
+            type=sha,prefix=,suffix=,format=long
+      - name: Registry login
+        uses: docker/login-action@v3
+        with:
+          registry: git.etc.nu
+          username: "${{ inputs.user }}"
+          password: "${{ inputs.token }}"
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push image
+        uses: docker/build-push-action@v6
+        id: build
+        with:
+          file: ${{ inputs.dockerfile }}
+          context: ${{ inputs.context }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ inputs.image }}/cache
+          cache-to: type=registry,ref=${{ inputs.image }}/cache,mode=max
+    outputs:
+      tag: ${{ fromJSON(steps.meta.outputs.json).tags[0] }}
+      image: ${{ inputs.image }}
+      sha: ${{ gitea.sha }}