feat: add --autopush flag to build-image.sh for non-interactive builds

Add optional --autopush parameter to skip the interactive push prompt and automatically push built images to registry. Useful for CI/CD pipelines and automated builds.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

mailgun-webhook/build-image.sh

@@ -2,14 +2,19 @@
 
 if [ "$1" == "" ] ; then
     printf "\nYou did not specify the Docker image version to build"
-    printf "\n\nSyntax:\n\n    build-image.sh 1.0.0\n\n"
+    printf "\n\nSyntax:\n\n    build-image.sh 1.0.0 [--autopush]\n\n"
     exit 1
 fi
 
-read -p "BUILD: Push new image to registry [y/n]? " -n 1 -r
-echo    # (optional) move to a new line
-
-PUSH_IMAGE="$REPLY"
+# Check for --autopush flag
+if [ "$2" == "--autopush" ]; then
+    PUSH_IMAGE="y"
+    printf "\nAuto-push enabled. Image will be pushed to registry.\n"
+else
+    read -p "BUILD: Push new image to registry [y/n]? " -n 1 -r
+    echo    # (optional) move to a new line
+    PUSH_IMAGE="$REPLY"
+fi
 
 printf "\nBUILD START ...\n\n"