init

.github/workflows/docker.yml

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+name: docker
+
+on:
+  push:
+    tags:
+      - "v*"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository_owner }}/git
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - id: docker_meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - id: docker_build
+        name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          platforms: linux/amd64
+          push: true
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@main
+
+      - name: Sign image with a key
+        run: |
+          cosign sign --key env://COSIGN_PRIVATE_KEY ${IMAGE_NAME,,}@${IMAGE_DIGEST} --yes
+        env:
+          IMAGE_NAME: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          IMAGE_DIGEST: ${{ steps.docker_build.outputs.digest }}
+          COSIGN_PRIVATE_KEY: ${{secrets.COSIGN_PRIVATE_KEY}}
+          COSIGN_PASSWORD: ${{secrets.COSIGN_PASSWORD}}

Dockerfile

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+FROM alpine/git
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENV GIT_USERNAME ""
+ENV GIT_PASSWORD ""
+ENTRYPOINT [ "/entrypoint.sh" ]

cosign.pub

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+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEY6IaucQO23v72ulwpMUgkLesFw1F
+q45PKMvlKu3FlYYf0th9+qBIXhcoMex8hyz2wzE/p8YwQ9JmPm8O5HZang==
+-----END PUBLIC KEY-----

entrypoint.sh

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+#!/bin/sh
+set -e
+
+git config --global --add safe.directory '*';
+git config credential.helper '!f() { 
+    sleep 1; 
+    echo "username=${GIT_USERNAME}"; 
+    echo "password=${GIT_PASSWORD}"; 
+}; f'
+
+trap "rm -f ~/.git-credentials" EXIT
+exec git $@