fix(Dockerfile): checkout master

Dockerfile

@@ -51,15 +51,18 @@ RUN set -ex; \
       | cut -d: -f1 \
       | sort -u \
       | xargs -rt apt-mark manual; \
-  apt-get purge --yes --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
-  rm --recursive --force /var/lib/apt/lists/*
-
-RUN set -eu; \
+    if [ ! -z ${POSTFIXADMIN_VERSION} ]; then \
       curl --fail --silent --show-error --location "https://github.com/postfixadmin/postfixadmin/archive/postfixadmin-${POSTFIXADMIN_VERSION}.tar.gz" --output postfixadmin.tar.gz; \
       tar --extract --file postfixadmin.tar.gz --directory /var/www/html --strip-components=1; \
       rm postfixadmin.tar.gz; \
-  # Does not exist in tarball but is required
-  mkdir --parents /var/www/html/templates_c; \
+    else \
+      apt-get install --yes git; \
+      git clone https://github.com/postfixadmin/postfixadmin.git /var/www/html; \
+    fi; \
+    apt-get purge --yes --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+    rm --recursive --force /var/lib/apt/lists/*
+
+RUN mkdir --parents /var/www/html/templates_c; \
     chown --recursive www-data:www-data /var/www/html
 
 COPY entrypoint.sh /usr/local/bin/

Makefile

@@ -20,7 +20,6 @@ PHONY:=container-image/build
 container-image/build:
 	${CONTAINER_RUNTIME} build \
 		--build-arg POSTFIXADMIN_VERSION=${POSTFIXADMIN_VERSION} \
-		--build-arg POSTFIXADMIN_SHA512=${POSTFIXADMIN_SHA512} \
 		--file Dockerfile \
 		--no-cache \
 		--pull \