build: generate template tar.gz on release

.github/workflows/release.yml

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+name: Release
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - name: nextjs-blank
+            target: scratch_nextjs_blank
+            out: nextjs-blank.tar.gz
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Prepare template ${{ matrix.name }}
+        uses: docker/build-push-action@v5
+        with:
+          file: Dockerfile
+          cache-from: type=gha,scope=cached-stage
+          # Exports the artefacts from the final stage
+          outputs: ./out
+          target: ${{ matrix.target }}
+
+      - run: sha256sum out/${{ matrix.out }}
+
+      - run: mv out/${{ matrix.out }} ${{ matrix.out }}
+
+      - name: 'Upload ${{ matrix.name }}'
+        uses: actions/upload-artifact@v4
+        with:
+          # name is the name used to display and retrieve the artifact
+          name: ${{ matrix.name }}
+          # path is the name used as the file to upload and the name of the
+          # downloaded file
+          path: ./${{ matrix.out }}
+
+  release:
+    runs-on: ubuntu-latest
+    needs: ['docker-build']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download nextjs-blank
+        uses: actions/download-artifact@v4
+        with:
+          name: nextjs-blank.tar.gz
+          path: .
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            ./nextjs-blank.tar.gz

Dockerfile

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+FROM alpine:3.19.1 as deps
+
+# Install bash package
+RUN apk add --no-cache bash
+
+# Create and use a user instead of using root
+RUN addgroup -S appgroup && adduser -S apprunner -G appgroup
+USER apprunner
+
+# Define working directories
+WORKDIR /prepare
+
+# Copy resources
+COPY --chown=apprunner:apprunner . /prepare
+
+# Create output directory
+RUN mkdir -p ./target
+
+FROM deps as build_nextjs_blank
+
+RUN ./docker/compress app/nextjs-blank
+
+FROM scratch AS scratch_nextjs_blank
+COPY --from=build_nextjs_blank ./prepare/target/nextjs-blank.tar.gz /

docker/compress

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+#!/usr/bin/env bash
+
+# Check if an argument is provided
+if [ "$#" -eq 0 ]; then
+    echo "Usage: $0 <subdirectory>"
+    exit 1
+fi
+
+# Construct the path
+path="./templates/$1"
+
+# Check if the directory exists
+if [ ! -d "$path" ]; then
+    echo "Directory $path does not exist. Skipping."
+    exit 0
+fi
+
+function compress() {
+    local folder=$1
+
+    # Extract the base name of the folder to use as the archive name
+    local foldername=$(basename "$folder")
+
+    local output="./target/${foldername}.tar.gz"
+
+    # Create a tar.gz file for the folder
+    tar -czf "$output" -C "$(dirname "$folder")" "$(basename "$folder")"
+
+    sha256sum "$output"
+}
+
+compress "$path"