Introduce automated deploy to WP.org

Ported from 10up's GitHub Action: https://github.com/10up/actions-wordpress/blob/598b1572d5024340f09d7efc083a65ebff3bcdef/dotorg-plugin-deploy/entrypoint.sh

bin/deploy.sh

@@ -58,11 +58,6 @@ if [[ -z "$PLUGIN_VERSION" ]]; then
 	exit 1
 fi
 
-if [[ -z "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" || "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" != "master" ]]; then
-	echo "Build branch is required and must be 'master'" 1>&2
-	exit 0
-fi
-
 echo "ℹ︎ PLUGIN_SLUG is $PLUGIN_SLUG"
 echo "ℹ︎ PLUGIN_VERSION is $PLUGIN_VERSION"
 
@@ -77,21 +72,21 @@ svn checkout --depth immediates "$SVN_URL" "$SVN_DIR"
 cd "$SVN_DIR"
 svn update --set-depth infinity trunk
 
+# Ensure we are in the $CI_PROJECT_DIR directory, just in case
 echo "➤ Copying files..."
-cd "$CI_BUILDS_DIR"
+cd "$CI_PROJECT_DIR"
 
 git config --global user.email "git-contrib+ci@ethitter.com"
 git config --global user.name "Erick Hitter (GitLab CI)"
 
 # If there's no .gitattributes file, write a default one into place
-if [[ ! -e "$CI_BUILDS_DIR/.gitattributes" ]]; then
-	cat > "$CI_BUILDS_DIR/.gitattributes" <<-EOL
+if [[ ! -e "$CI_PROJECT_DIR/.gitattributes" ]]; then
+	cat > "$CI_PROJECT_DIR/.gitattributes" <<-EOL
 	/.gitattributes export-ignore
 	/.gitignore export-ignore
 	/.github export-ignore
 	EOL
 
-	# Ensure we are in the $CI_BUILDS_DIR directory, just in case
 	# The .gitattributes file has to be committed to be used
 	# Just don't push it to the origin repo :)
 	git add .gitattributes && git commit -m "Add .gitattributes file"
@@ -122,6 +117,12 @@ svn cp "trunk" "tags/$PLUGIN_VERSION"
 
 svn status
 
+# Stop here unless this is a merge into master.
+if [[ -z "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" || "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" != "master" ]]; then
+	echo "ℹ︎ EXITING before commit step as this is the '${CI_MERGE_REQUEST_TARGET_BRANCH_NAME}' branch, not the 'master' branch." 1>&2
+	exit 0
+fi
+
 echo "➤ Committing files..."
 svn commit -m "Update to version $PLUGIN_VERSION from GitLab ($CI_PROJECT_URL)" --no-auth-cache --non-interactive  --username "$SVN_USERNAME" --password "$SVN_PASSWORD"