prevent empty compose.extend.yml

.devcontainer/app/initializeCommand.sh

@@ -1,4 +1,9 @@
 # prevent file not found error on docker compose up
 if [ ! -f ".devcontainer/compose.extend.yml" ]; then
-  touch .devcontainer/compose.extend.yml
+
+cat > ".devcontainer/compose.extend.yml" <<EOF
+services:
+  {}
+EOF
+
 fi

.devcontainer/pdf-converter/initializeCommand.sh

@@ -1,4 +1,9 @@
 # prevent file not found error on docker compose up
 if [ ! -f ".devcontainer/compose.extend.yml" ]; then
-  touch .devcontainer/compose.extend.yml
+
+cat > ".devcontainer/compose.extend.yml" <<EOF
+services:
+  {}
+EOF
+
 fi