Allow automaticly creating PRs to test internal builds

.github/release.sh

@@ -5,9 +5,21 @@ BRANCH_NAME="release/$1"
 PR_TITLE="Release $1"
 PR_BODY="Update Diffblue Cover to $1"
 
+if [ -n "$2" ]; then
+     echo "Testing internal build"
+     BRANCH_NAME="testing/$1"
+     PR_TITLE="Testing $1"
+fi
+
 git checkout -b "$BRANCH_NAME"
 
-sed -i "s/cli:[0-9]\{4\}\.[0-9]\{2\}\.[0-9]\{2\}-jdk/cli:$1-jdk/g" Dockerfile
+if [ -n "$2" ]; then
+     DOCKER_VERSION=$(echo "${2,,}-${1,,}" | sed 's/\//-/g')
+     sed -i "s/cli:[0-9]\{4\}\.[0-9]\{2\}\.[0-9]\{2\}-jdk/cli:$DOCKER_VERSION-jdk/g" Dockerfile
+     sed -i "s|diffblue\/cover-cli:|docker.io/diffblue\/internal-cover-cli:|g" Dockerfile
+else
+     sed -i "s/cli:[0-9]\{4\}\.[0-9]\{2\}\.[0-9]\{2\}-jdk/cli:$1-jdk/g" Dockerfile
+fi
 
 ./build.sh
 git add Dockerfile