Multi compiler test (#5991)

* First attempt with GCC only

* Make the test run on every push temporarily

Also clean up the description of the workflow

* Fix invalid job name

* Missing hunks added

* Try out matrix actions

* Fix missing 'runs-on'

* Only needs to run on Ubuntu

* Use local installations of gcc/clang instead of containers

* Explicitly list out compilers to test

* Clean up names and concurrency group

* Only need to run on PRs and important branches

Co-authored-by: Andras Fekete <andras@wolfssl.com>

.github/workflows/multi-compiler.yml

@@ -0,0 +1,39 @@
+name: Multiple compilers and versions
+concurrency:
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches: [ 'master', 'main', 'release/**' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  my_matrix:
+    name: Compiler test
+    strategy:
+      matrix:
+        include:
+          - CC: gcc-9
+            CXX: g++-9
+          - CC: gcc-10
+            CXX: g++-10
+          - CC: gcc-11
+            CXX: g++-11
+          - CC: gcc-12
+            CXX: g++-12
+          - CC: clang-12
+            CXX: clang++-12
+          - CC: clang-13
+            CXX: clang++-13
+          - CC: clang-14
+            CXX: clang++-14
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build
+        env:
+            CC: ${{ matrix.CC }}
+            CXX: ${{ matrix.CXX }}
+        run: ./autogen.sh && ./configure && make && make dist