Add ccache Github workflow

.github/workflows/ccache-build.yaml

@@ -0,0 +1,56 @@
+---
+name: DNF 5 Build
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-with-ccache:
+    name: Build with CCache
+    runs-on: ubuntu-latest
+    container:
+      image: fedora:rawhide
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      # this step needs to be incorporated in our container that we use for testing
+      - name: Install dependencies
+        run: |
+          dnf install -y ccache && dnf builddep -y ./dnf5.spec
+
+      - name: Prepare CCache timestamp
+        id: ccache_cache_timestamp
+        run:
+          echo "timestamp=$(date +%Y-%m-%d-%H:%M:%S)-UTC" >> "$GITHUB_OUTPUT"
+
+      - name: Cache CCache files
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/ccache
+          key: ${{ github.event.repository.name }}-ccache-pr-${{ github.event.number }}-${{ steps.ccache_cache_timestamp.outputs.timestamp }}
+          restore-keys: |
+            ${{ github.event.repository.name }}-ccache-pr-${{ github.event.number }}-
+            ${{ github.event.repository.name }}-ccache-pr-
+            ${{ github.event.repository.name }}-
+
+      - name: Create CCache symlinks to prioritize it over GCC
+        run: |
+            ln -s /usr/bin/ccache /usr/local/bin/gcc
+            ln -s /usr/bin/ccache /usr/local/bin/g++
+            ln -s /usr/bin/ccache /usr/local/bin/cc
+            ln -s /usr/bin/ccache /usr/local/bin/c++
+
+      - name: Zero CCache statistics
+        run: ccache -z
+
+      - name: Configure DNF5 with CMake
+        run: cmake -S . -B build
+
+      - name: Build DNF5
+        run: cmake --build build
+
+      - name: Display CCache statistics
+        run: ccache -s