first commit

.forgejo/workflows/docker-build.yaml

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+name: Docker Build
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  IMAGE: git.kvant.cloud/${{ github.repository }}
+  VERSION: ${{ github.ref_name }}
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        
+      - name: Login to gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.kvant.cloud
+          username: ${{ vars.PHOENIX_PACKAGE_WRITER_USERNAME }}
+          password: ${{ secrets.PHOENIX_PACKAGE_WRITER_TOKEN }}
+
+      - name: Build and push to gitea registry
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          context: .
+          build-args: |
+            VERSION=${{ env.VERSION }}
+          image: ${{ env.IMAGE }}
+          cache-from: |
+            type=registry,ref=${{ env.IMAGE }}:${{ env.VERSION }}
+            type=registry,ref=${{ env.IMAGE }}:latest            
+          cache-to: type=inline
+          tags: |
+            ${{ env.IMAGE }}:${{ env.VERSION }}
+            ${{ env.IMAGE }}:latest
+

Dockerfile

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+FROM alpine:latest
+
+RUN apk update && \
+    apk add s3cmd
+
+ENTRYPOINT ["/usr/bin/s3cmd"]