CI: simplify compiler selection and add gcc13

Allows more testing with future compilers.

Signed-off-by: Rosen Penev <[email protected]>

.github/workflows/build.yml

@@ -33,24 +33,22 @@ jobs:
   build-linux:
     strategy:
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04]
-        include:
-          - os: ubuntu-22.04
-            cc: gcc-11
-            cxx: g++-11
-          - os: ubuntu-20.04
-            cc: gcc-10
-            cxx: g++-10
+        cc: ['10', '11', '13']
+        os: [ubuntu-20.04]
 
     runs-on: ${{ matrix.os }}
 
     env:
-      CC: ccache ${{ matrix.cc }}
-      CXX: ccache ${{ matrix.cxx }}
+      CC: ccache gcc-${{ matrix.cc }}
+      CXX: ccache g++-${{ matrix.cc }}
 
     steps:
       - id: checkout
         uses: actions/checkout@v4
+      - id: setup-gcc
+        uses: egor-tensin/setup-gcc@v1
+        with:
+          version: ${{matrix.cxx}}
       - id: cache-ccache
         uses: hendrikmuhs/ccache-action@v1
         with:
@@ -59,7 +57,6 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y --no-install-recommends \
-            ${{ matrix.cxx }} ${{matrix.cc }} \
             libfmt-dev \
             libgtest-dev \
             libpcre2-dev \