feat(cleanup-branches): input logic and error handling improvements (#1395)

add handling for when no branches qualify for deletion
swap handling for inputs.dry-run so that any unknown input value will
default to dry-run

Author: ricky-undeadcoders

actions/cleanup-branches/action.yml

@@ -73,11 +73,19 @@ runs:
         done
     - name: Delete branches (dry run)
       shell: bash
-      if: ${{ inputs.dry-run == 'true' }}
+      if: ${{ inputs.dry-run != 'false' }}
       run: |
+        if [[ ! -s branches.txt ]]; then
+          echo "🟢 No branches marked for deletion."
+          exit 0
+        fi
         cat branches.txt | xargs -I {} echo git push origin --delete "{}"
     - name: Delete branches
       shell: bash
-      if: ${{ inputs.dry-run != 'true' }}
+      if: ${{ inputs.dry-run == 'false' }}
       run: |
+        if [[ ! -s branches.txt ]]; then
+          echo "🟢 No branches marked for deletion."
+          exit 0
+        fi
         cat branches.txt | xargs -I {} git push origin --delete "{}"