Add dockerfile

.github/workflows/docker.yaml

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+name: docker
+
+on:
+  push:
+    tags:
+      - "v*"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository_owner }}/atlantis
+
+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 ghcr.io/runatlantis/atlantis:latest
+
+RUN curl -LO https://github.com/plumber-cd/terraform-backend-git/releases/download/v0.1.5/terraform-backend-git-linux-amd64
+
+# Rename the downloaded binary to "terraform-backend-git"
+RUN mv terraform-backend-git-linux-amd64 /usr/local/bin/terraform-backend-git
+
+# Set executable permissions for the terraform-backend-git binary
+RUN chmod +x /usr/local/bin/terraform-backend-git
+
+RUN curl -LO https://releases.hashicorp.com/vault/1.14.3/vault_1.14.3_linux_amd64.zip && unzip vault_1.14.3_linux_amd64.zip
+
+RUN mv vault /usr/local/bin/vault