ci: multi-arch build

Author: axelrindle

.github/workflows/build.yml

@@ -21,32 +21,35 @@ jobs:
           - pcntl
           - zip
           - intl
-    name: ext-${{ matrix.extension }}@php${{ matrix.php_version }}
+        arch:
+          - amd64
+          - arm64
+    name: ext-${{ matrix.extension }}@php${{ matrix.php_version }}@${{ matrix.arch }}
     steps:
-      - uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php_version }}
+      - uses: actions/checkout@v4
 
-      - name: Find extension directory
-        id: extension_dir
-        run: |
-          php -r 'echo "extension_dir=" . ini_get("extension_dir");' >> "$GITHUB_OUTPUT"
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: linux/${{ matrix.arch }}
 
-      - name: Install build script
-        run: |
-          curl https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions \
-            -o /usr/local/bin/install-php-extensions
-          chmod +x /usr/local/bin/install-php-extensions
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          platforms: linux/${{ matrix.arch }}
 
-      - name: Build extension
-        run: |
-          install-php-extensions ${{ matrix.extension }}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/${{ matrix.arch }}
+          push: false
+          outputs: .
 
       - name: Archive extension
         uses: actions/upload-artifact@v4
         with:
-          name: ext-${{ matrix.extension }}-php-${{ matrix.php_version }}
-          path: ${{ steps.extension_dir.outputs.extension_dir }}/${{ matrix.extension }}.so
+          name: ext-${{ matrix.extension }}-php-${{ matrix.php_version }}-${{ matrix.arch }}
+          path: ${{ matrix.extension }}.so
           retention-days: 1
 
   upload:

Dockerfile

@@ -0,0 +1,17 @@
+ARG PHP_VERSION=8.4
+
+FROM php:${PHP_VERSION}-cli AS build
+
+ADD --chmod=0755 https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
+
+ARG EXTENSION=pgsql
+
+RUN EXTENSION_DIR="$(php -r "echo ini_get('extension_dir');")" && \
+    install-php-extensions "${EXTENSION}" && \
+    mkdir /data && \
+    cp "${EXTENSION_DIR}/${EXTENSION}.so" /data
+
+
+FROM scratch
+
+COPY --from=build /data/* .