Add forgejo actions (#852)

Reviewed-on: #852
Co-authored-by: Magnus Walbeck <mw@mwalbeck.org>
Co-committed-by: Magnus Walbeck <mw@mwalbeck.org>

php8.1/Dockerfile

@@ -0,0 +1,32 @@
+FROM php:8.1.31-cli-bullseye@sha256:e33d8dd6d5f9efc9a24116c84b7a8ada952296c0a53afb8070033226c57c6ea3
+
+SHELL [ "/bin/bash", "-exo", "pipefail", "-c" ]
+
+# renovate: datasource=github-tags depName=composer/composer versioning=semver
+ENV COMPOSER_VERSION 2.8.5
+ENV COMPOSER_INSTALLER_COMMIT 459bcaab2cc03f1656dd7b065d500d0cf3070e3f
+ENV COMPOSER_INSTALLER_HASH 756890a4488ce9024fc62c56153228907f1545c228516cbf63f885e036d37e9a59d27d63f46af1d4d07ee0f76181c7d3
+
+RUN apt-get update; \
+    apt-get install -y --no-install-recommends \
+        git \
+        unzip \
+        zip \
+    ; \
+    curl -o /tmp/composer-installer.php \
+    https://raw.githubusercontent.com/composer/getcomposer.org/${COMPOSER_INSTALLER_COMMIT}/web/installer; \
+    \
+    echo "${COMPOSER_INSTALLER_HASH} /tmp/composer-installer.php" | sha384sum -c -; \
+    \
+    php /tmp/composer-installer.php --no-ansi --install-dir=/usr/bin --filename=composer --version=${COMPOSER_VERSION}; \
+    \
+    composer diagnose; \
+    rm -f /tmp/composer-installer.php; \
+    \
+    rm -rf /var/lib/apt/lists/*;
+
+WORKDIR /tmp
+
+USER nobody
+
+CMD [ "composer" ]