actions: Fedora: Add Rawhide

Include Rawhide in the build matrix as well to spot upcoming issues,
first one would be dropping support for OpenJDK 17 in favor of
Adoptium managed Eclipse Temurin releases via separate repsitory:
https://fedoraproject.org/wiki/Changes/ThirdPartyLegacyJdks

Ideally this build should be gated as `allow-fail`, but
unfortunately github actions does not support it yet.

Signed-off-by: Priit Laes <plaes@plaes.org>

Author: plaes

.github/workflows/build.yml

@@ -79,12 +79,19 @@ jobs:
     container: fedora:${{ matrix.container }}
     strategy:
       matrix:
-        container: [40, 41]
+        container: [40, 41, rawhide]
     steps:
-    - name: Install Deps
+    - name: Install CMake
+      if: matrix.container != 'rawhide'
       run: |
         dnf install -y --setopt=install_weak_deps=False \
           ${FEDORA_DEPS} doxygen boost-test swig python3-devel java-17-openjdk-devel rpm-build git
+    - name: Install Deps
+      ## Fedora 42 (currently) rawhide doesn't have Java 17 JDK?
+      if: matrix.container == 'rawhide'
+      run: |
+        dnf install -y --setopt=install_weak_deps=False \
+          ${FEDORA_DEPS} doxygen boost-test swig python3-devel java-21-openjdk-devel rpm-build git
     - name: Checkout
       uses: actions/checkout@v4
     - name: Build