Add debugging info to action

.github/workflows/update.yaml

@@ -1,6 +1,7 @@
 name: Update
 on:
   pull_request:
+    branches: [main]
 
 jobs:
   ruletype-update:
@@ -9,6 +10,8 @@ jobs:
     steps:
     - name: Checkout current
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      with:
+        fetch-depth: ${{github.event_name == 'pull_request' && 2 || 0}}
 
     - name: Checkout comparison branch (main) in subdirectory
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -27,13 +30,20 @@ jobs:
         # Fail the script if any command fails
         set -e
 
+        git branch -a
         # Determine the current branch and compare branch (default to 'main')
-        GITHUB_BRANCH=${GITHUB_REF##*/}
+        GITHUB_BRANCH=remotes/${GITHUB_REF#*/}
         COMPARE_BRANCH="main"
 
+        git log
+
         # Show changed files between the current branch and the comparison branch
-        echo "Comparing $GITHUB_BRANCH with $COMPARE_BRANCH..."
-        CHANGED_FILES=$(git diff --name-only origin/$COMPARE_BRANCH...$GITHUB_BRANCH)
+        # See https://stackoverflow.com/a/74268200 for why diffing with HEAD^1 is used
+        echo "Comparing $GITHUB_BRANCH (from '$GITHUB_REF') with $COMPARE_BRANCH..."
+        CHANGED_FILES=$(git diff --name-only -r HEAD^1 HEAD)
+        echo $CHANGED_FILES
+        echo ----
+        git diff --name-only "$COMPARE_BRANCH" "$GITHUB_BRANCH"
 
         if [ -z "$CHANGED_FILES" ]; then
           echo "No changes found."
@@ -49,6 +59,8 @@ jobs:
       run: |
         # Fail the script if any command fails
         set -e
+
+        go build -o ./mindev github.com/mindersec/minder/cmd/dev@latest
         
         # Loop through the changed files and run the go command for each
         for FILE in ${{ env.changed_files }}; do
@@ -61,7 +73,7 @@ jobs:
           if [ -f "$BEFORE_FILE" ]; then
             echo "Running ruletype validate-update command for $BEFORE_FILE and $AFTER_FILE..."
             # Run the go command with the before and after files
-            go run github.com/mindersec/minder/cmd/dev@latest ruletype validate-update --before "$BEFORE_FILE" --after "$AFTER_FILE"
+            ./mindev ruletype validate-update --before "$BEFORE_FILE" --after "$AFTER_FILE"
           else
             echo "Warning: $BEFORE_FILE does not exist, skipping."
           fi