Github actions: Modernize CI

.github/actions/install-ubuntu/action.yml

@@ -10,6 +10,7 @@ runs:
              libboost-dev \
              libboost-filesystem-dev \
              libboost-program-options-dev \
+             libbz2-dev \
              libgdal-dev \
              libproj-dev \
              libsparsehash-dev

.github/workflows/ci.yml

@@ -181,19 +181,12 @@ jobs:
       - uses: ./.github/actions/ctest
 
   ubuntu-latest:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
-      CC: clang-15
-      CXX: clang++-15
+      CC: clang-18
+      CXX: clang++-18
       BUILD_TYPE: Dev
     steps:
-      - name: Install new clang
-        run: |
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo tee /etc/apt/trusted.gpg.d/llvm-snapshot.asc
-          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
-          sudo apt-get update -qq
-          sudo apt-get install -yq clang-15
-        shell: bash
       - uses: actions/checkout@v4
       - uses: ./.github/actions/install-ubuntu
       - uses: ./.github/actions/install-from-git

README.md

@@ -6,7 +6,7 @@ to work with the Osmium library.
 
 You have to set up [Libosmium](https://osmcode.org/libosmium) first.
 
-[![Build Status](https://github.com/osmcode/osmium-contrib/workflows/CI/badge.svg?branch=master)](https://github.com/osmcode/osmium-contrib/actions)
+[![Build Status](https://github.com/osmcode/osmium-contrib/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/osmcode/osmium-contrib/actions)
 
 
 ## Building