Merge 'docker: update LLVM debian repo for Ubuntu Orcular migration' …

…from Kefu Chai

When migrating from Ubuntu Matis to Orcular in afea41b, the LLVM debian package repository configuration wasn't updated accordingly. This caused Docker builds to fail.

This commit updates the repository configuration to match the new Ubuntu Orcular base image.

Fixes #2656

Closes #2658

* https://github.com/scylladb/seastar:
  github:  add Docker build verification workflow
  docker: update LLVM debian repo for Ubuntu Orcular migration

.github/workflows/docker.yaml

@@ -0,0 +1,35 @@
+name: Verify Dockerfile Build
+
+on:
+  pull_request:
+    paths:
+      - 'docker/dev/Dockerfile'
+      - 'install-dependencies.sh'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  build:
+    timeout-minutes: 20
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: |
+            docker/dev/Dockerfile
+            install-dependencies.sh
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: docker/dev/Dockerfile
+          push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

docker/dev/Dockerfile

@@ -6,9 +6,9 @@ RUN --mount=type=bind,source=./install-dependencies.sh,target=/install-dependenc
     apt-get update && apt-get install -y \
     curl \
     gnupg \
-    && echo "deb http://apt.llvm.org/mantic/ llvm-toolchain-oracular-18 main" \
+    && echo "deb http://apt.llvm.org/oracular/ llvm-toolchain-oracular-18 main" \
     >> /etc/apt/sources.list.d/llvm.list \
-    && echo "deb http://apt.llvm.org/mantic/ llvm-toolchain-oracular-19 main" \
+    && echo "deb http://apt.llvm.org/oracular/ llvm-toolchain-oracular-19 main" \
     >> /etc/apt/sources.list.d/llvm.list \
     && curl -sSL https://apt.llvm.org/llvm-snapshot.gpg.key -o /etc/apt/trusted.gpg.d/apt.llvm.org.asc \
     && apt-get update && apt-get install -y \