Add Dockerfile

.github/workflows/build.yml

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+name: Build and Push Docker Images
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Read restic version
+        id: getversion
+        run: echo "::set-output name=version::$(grep -oP '(?<=restic/restic:)[\d\.]+' Dockerfile)"
+
+      - name: Print version
+        run: echo ${{ steps.getversion.outputs.version }}
+
+      - name: Build and push the image
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ghcr.io/querateam/resticronic:${{ steps.getversion.outputs.version }}

Dockerfile

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+FROM restic/restic:0.17.3
+
+RUN apk add --no-cache tzdata tini supercronic
+
+ENTRYPOINT ["/sbin/tini", "--"]