feat: use default path, lint bash script & show diff

.github/workflows/main.yml

@@ -24,6 +24,10 @@ jobs:
       - name: Test actions
         uses: ./
         with:
-          path: $GITHUB_WORKSPACE
           updpkgsums: true
           srcinfo: true
+
+      - name: Show diff
+        run: |
+          git diff PKGBUILD
+          git diff .SRCINFO

entrypoint.sh

@@ -1,6 +1,6 @@
 #!/bin/sh -l
 
-sudo chown -R builder $GITHUB_WORKSPACE
+sudo chown -R builder $INPUT_PATH
 cd $INPUT_PATH
 
 if [[ $INPUT_UPDPKGSUMS == true ]]; then
@@ -15,8 +15,10 @@ if [[ $INPUT_SRCINFO == true ]]; then
     git diff .SRCINFO
 fi
 
-echo "Run makepkg with flags"
-sudo -u builder makepkg $INPUT_FLAGS
+if [[ -n "$INPUT_FLAGS" ]]; then
+    echo "Run makepkg with flags"
+    sudo -u builder makepkg $INPUT_FLAGS
+fi
 
 if [[ $INPUT_NAMCAP == true ]]; then
     echo "Validate PKGBUILD with namcap"