feat: add --auto-version flag with registry check to build-image.sh

Add --auto-version flag to automatically use version from package.json and check if image already exists in registry before building. If image exists, script exits to prevent duplicate versions. Rename --autopush to --auto-push for consistent flag naming.

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

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

mailgun-webhook/build-image.sh

@@ -1,13 +1,54 @@
 #!/bin/bash
 
-if [ "$1" == "" ] ; then
+# Parse flags
+AUTO_VERSION=false
+AUTO_PUSH=false
+IMAGE_VERSION=""
+
+for arg in "$@"; do
+    case $arg in
+        --auto-version)
+            AUTO_VERSION=true
+            ;;
+        --auto-push)
+            AUTO_PUSH=true
+            ;;
+        *)
+            if [ "$IMAGE_VERSION" == "" ] && [[ ! "$arg" =~ ^-- ]]; then
+                IMAGE_VERSION=$arg
+            fi
+            ;;
+    esac
+done
+
+# Determine version
+if [ "$AUTO_VERSION" = true ]; then
+    IMAGE_VERSION=$(node -p "require('./package.json').version")
+    printf "\nAuto-version enabled. Using version from package.json: %s\n" "$IMAGE_VERSION"
+elif [ "$IMAGE_VERSION" == "" ]; then
     printf "\nYou did not specify the Docker image version to build"
-    printf "\n\nSyntax:\n\n    build-image.sh 1.0.0 [--autopush]\n\n"
+    printf "\n\nSyntax:\n\n    build-image.sh <version> [--auto-push]"
+    printf "\n    build-image.sh --auto-version [--auto-push]\n\n"
     exit 1
 fi
 
-# Check for --autopush flag
-if [ "$2" == "--autopush" ]; then
+REGISTRY_URL="registry.budakova.org"
+IMAGE_NAME=$(node -p "require('./package.json').name")
+IMAGE_TAG=$REGISTRY_URL/$IMAGE_NAME:$IMAGE_VERSION
+
+# Check if image already exists in registry (only when using auto-version)
+if [ "$AUTO_VERSION" = true ]; then
+    printf "\nChecking if image %s already exists in registry...\n" "$IMAGE_TAG"
+    if docker manifest inspect $IMAGE_TAG > /dev/null 2>&1; then
+        printf "\nERROR: Image %s already exists in registry.\n" "$IMAGE_TAG"
+        printf "Please update the version in package.json before building.\n\n"
+        exit 1
+    fi
+    printf "Image does not exist in registry. Proceeding with build.\n"
+fi
+
+# Check for push preference
+if [ "$AUTO_PUSH" = true ]; then
     PUSH_IMAGE="y"
     printf "\nAuto-push enabled. Image will be pushed to registry.\n"
 else
@@ -18,11 +59,6 @@ fi
 
 printf "\nBUILD START ...\n\n"
 
-REGISTRY_URL="registry.budakova.org"
-IMAGE_NAME=$(node -p "require('./package.json').name")
-IMAGE_VERSION=$1
-
-IMAGE_TAG=$REGISTRY_URL/$IMAGE_NAME:$IMAGE_VERSION
 docker build . -t $IMAGE_TAG
 
 if [[ "$PUSH_IMAGE" =~ ^[Yy]$ ]]