add ci

.github/workflows/docker-image-push.yml

@@ -0,0 +1,69 @@
+name: Docker Image CI
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '4 20 * * 4'
+  push:
+    branches: [ main ]
+
+jobs:
+  latest_version:
+    runs-on: ubuntu-latest
+    outputs:
+      tag: ${{ steps.fetch_tag.outputs.tag }}
+    steps:
+      - name: Fetch latest version
+        id: fetch_tag
+        run: |
+          API_TOKEN="${{ secrets.GITHUB_TOKEN }}"
+          REPO_OWNER="just-containers"
+          REPO_NAME="s6-overlay"
+          
+          curl -sH "Authorization: token $API_TOKEN" https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/releases/latest > latest_version.json
+          
+          tag_name=$(jq -r '.tag_name' latest_version.json)
+          echo "::set-output name=tag::$tag_name"
+
+  check_image_tag:
+    runs-on: ubuntu-latest
+    needs: latest_version
+    outputs:
+      image_exists: ${{ steps.check_image.outputs.exists }}
+    steps:
+      - name: Check image tag exists
+        id: check_image
+        run: |
+          IMAGE_NAME="hakindazz/s6-overlay-base"
+          IMAGE_TAG=${{ needs.latest_version.outputs.tag }}
+          docker pull "$IMAGE_NAME:$IMAGE_TAG" &> /dev/null
+          if [ $? -eq 0 ]; then
+            echo "::set-output name=exists::true"
+          else
+            echo "::set-output name=exists::false"
+          fi
+
+  build-and-push:
+    runs-on: ubuntu-latest
+    needs: [latest_version, check_image_tag]
+    if: "!needs.check_image_tag.outputs.image_exists"
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            hakindazz/s6-overlay-base:latest
+            hakindazz/s6-overlay-base:${{ needs.latest_version.outputs.tag }}

Dockerfile

@@ -1,6 +1,4 @@
-FROM alpine:3
-
-ENV S6_PATH=/s6/root
+FROM alpine:3 AS s6
 
 ARG TARGETARCH
 ARG TARGETVARIANT
@@ -25,4 +23,7 @@ RUN apk add --no-cache curl jq \
     && sha256sum -c s6-overlay-${S6_PLATFORM}.tar.xz.sha256 \
     && mkdir -p /s6/root \
     && tar -C /s6/root -Jxpf /tmp/s6-overlay-noarch.tar.xz \
-    && tar -C /s6/root -Jxpf /tmp/s6-overlay-${S6_PLATFORM}.tar.xz
+    && tar -C /s6/root -Jxpf /tmp/s6-overlay-${S6_PLATFORM}.tar.xz
+
+FROM scratch
+COPY --from=s6 /s6/root /s6/root

Makefile

@@ -1,3 +1,8 @@
 
+.PHONY: build
 build:
-	docker build --no-cache --build-arg S6_RELEASE=3.2.0.0 -t hakindazz/s6-overlay:3.2.0.0 .
+	docker build --no-cache --build-arg S6_RELEASE=3.2.0.0 -t hakindazz/s6-overlay-base:3.2.0.0 .
+
+.PHONY: push
+push:
+	docker push hakindazz/s6-overlay-base:3.2.0.0

README.md

@@ -1,10 +1,10 @@
 # s6-overlay base image
-This repo tries to fill a small gap by providing a s6-overlay base image.
+This repo fills a small gap by providing a s6-overlay base image.
 
 ## Usage
 
 ```Dockerfile
-FROM hakindazz/s6-overlay AS s6-overlay
+FROM hakindazz/s6-overlay-base AS s6-overlay
 FROM alpine3
 
 COPY --from=s6-overlay /s6/root /