CLI-1168: Improve Dockerfile (#1618)

docker/Dockerfile

@@ -0,0 +1,14 @@
+FROM php:8-alpine
+
+RUN set -eux ; \
+  apk add --no-cache \
+    tini
+
+RUN curl https://github.com/acquia/cli/releases/latest/download/acli.phar -L -o /usr/local/bin/acli \
+  && chmod +x /usr/local/bin/acli
+
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+CMD ["acli"]

docker/docker-entrypoint.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+isCommand() {
+  # Retain backwards compatibility with common CI providers,
+  # see: https://github.com/composer/docker/issues/107
+  if [ "$1" = "sh" ]; then
+    return 1
+  fi
+
+  acli help --no-interaction "$1" > /dev/null 2>&1
+}
+
+# check if the first argument passed in looks like a flag
+if [ "${1#-}" != "$1" ]; then
+  set -- /sbin/tini -- acli "$@"
+# check if the first argument passed in is acli
+elif [ "$1" = 'acli' ]; then
+  set -- /sbin/tini -- "$@"
+# check if the first argument passed in matches a known command
+elif isCommand "$1"; then
+  set -- /sbin/tini -- acli "$@"
+fi
+
+exec "$@"