Add GitHub Actions workflow to check for HTTP URLs

.github/workflows/nohttp.yml

@@ -0,0 +1,28 @@
+name: Verify HTTPS URLs are used
+
+on:
+  push:
+    branches:
+      - main
+      - 'r5.*'
+  pull_request:
+    branches:
+      - '*'
+jobs:
+  nohttp:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/cache@v1
+        with:
+          path: /root/.jbang
+          key: $-jbang-$
+          restore-keys: |
+            $-jbang-
+      - name: 'Run nohttp'
+        uses: jbangdev/jbang-action@v0.119.0
+        with:
+          script: io.spring.nohttp:nohttp-cli:0.0.9
+          scriptargs: "-D=\\.git -D=build -D=target -D=apache-ant-.+ -F=maven-wrapper\\.properties -F=mvnw\\.cmd -Fmvnw"
+        env:
+          JBANG_REPO: /root/.jbang/repository