other ubuntu verisons

Author: djdefi

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: ['ubuntu-latest', 'macos-latest']
+        os: ['ubuntu-20.04', 'ubuntu-18.04', 'ubuntu-16.04', 'macos-latest']
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -17,7 +17,7 @@ jobs:
         wget "https://storage.googleapis.com/shellcheck/shellcheck-v0.7.0.linux.x86_64.tar.xz"
         tar --xz -xvf "shellcheck-v0.7.0.linux.x86_64.tar.xz"
         sudo cp shellcheck-v0.7.0/shellcheck /usr/bin/shellcheck
-      if: matrix.os == 'ubuntu-latest'
+      if: matrix.os == ['ubuntu-20.04', 'ubuntu-18.04', 'ubuntu-16.04']
     - name: Install Dependencies (macOS)
       run: |
         brew install gnu-tar shellcheck jq pigz coreutils