chore(deps): bump github/codeql-action from 3 to 4

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 3 to 4.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/codeql-action/compare/v3...v4)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/scorecard.yml

@@ -0,0 +1,43 @@
+name: Scorecard supply-chain security
+on:
+  branch_protection_rule:
+  schedule:
+    - cron: "31 17 * * 5"
+  push:
+    branches: ["main"]
+
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    if: github.event.repository.default_branch == github.ref_name || github.event_name == 'pull_request'
+    permissions:
+      security-events: write
+      id-token: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        with:
+          persist-credentials: false
+
+      - name: Run analysis
+        uses: ossf/scorecard-action@f49aabe0b5af0936a0987cfb85d86b75731b0186
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      - name: Upload to code-scanning
+        uses: github/codeql-action/upload-sarif@v4
+        with:
+          sarif_file: results.sarif

README.md

@@ -10,6 +10,9 @@
     <img alt="Issues" src="https://img.shields.io/github/issues/steveiliop56/tinyauth">
     <img alt="Tinyauth CI" src="https://github.com/steveiliop56/tinyauth/actions/workflows/ci.yml/badge.svg">
     <a title="Crowdin" target="_blank" href="https://crowdin.com/project/tinyauth"><img src="https://badges.crowdin.net/tinyauth/localized.svg"></a>
+    <a href="https://scorecard.dev/viewer/?uri=github.com/steveiliop56/tinyauth" target="_blank" title="OpenSSF Scorecard">
+      <img src="https://api.scorecard.dev/projects/github.com/steveiliop56/tinyauth/badge">
+    </a>
 </div>
 
 <br />

internal/bootstrap/app_bootstrap.go

@@ -47,6 +47,10 @@ func (app *BootstrapApp) Setup() error {
 	fmt.Println("Tinyauth is moving to an organization! All versions after v5.0.7 will be released under ghcr.io/tinyauthapp/tinyauth. Existing images will continue to work but new features and updates (including security ones) will only be released under the new image path.")
 
 	// get app url
+	if app.config.AppURL == "" {
+		return fmt.Errorf("app URL cannot be empty, perhaps config loading failed")
+	}
+
 	appUrl, err := url.Parse(app.config.AppURL)
 
 	if err != nil {