Improve CI builds using matrix strategy

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  schedule:
+    # build the main branch every Monday morning
+    - cron: '37 9 * * 1'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [cc, clang, clang-13, gcc-10]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: ./autogen
+        run: ./autogen.sh
+      - name: Compiler version
+        run: $CC -v
+        env:
+          CC: ${{ matrix.compiler }}
+      - name: Install dependencies
+        run: sudo apt-get install autoconf libtls-dev libpcap-dev libnet1-dev libjson-c-dev
+      - name: ./configure
+        run: ./configure
+        env:
+          CC: ${{ matrix.compiler }}
+      - name: make
+        run: make

.github/workflows/clang.yml

@@ -1,24 +0,0 @@
-name: Clang CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install dependencies
-      run: |
-       sudo apt install clang autoconf libpcap-dev libssl-dev libnet1-dev libjson-c-dev
-    - name: autogen
-      run: ./autogen.sh
-    - name: configure
-      run: ./configure CC=/usr/bin/clang
-    - name: make
-      run: make

.github/workflows/gcc.yml

@@ -1,24 +0,0 @@
-name: GCC CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install dependencies
-      run: |
-       sudo apt install autoconf libpcap-dev libssl-dev libnet1-dev libjson-c-dev
-    - name: autogen
-      run: ./autogen.sh
-    - name: configure
-      run: ./configure CC=/usr/bin/gcc
-    - name: make
-      run: make

README.md

@@ -1,7 +1,6 @@
 # ssldump - (de-facto repository gathering patches around the cyberspace)
 
-![Clang CI](https://github.com/adulau/ssldump/workflows/Clang%20CI/badge.svg)
-![GCC CI](https://github.com/adulau/ssldump/workflows/GCC%20CI/badge.svg)
+[![Build CI](https://github.com/adulau/ssldump/actions/workflows/build.yml/badge.svg)](https://github.com/adulau/ssldump/actions/workflows/build.yml)
 
 # Release and tagging