Add basic GitHub CI workflow

This is testing the distribution on most
Perl version since 5.10 to 5.32

Note that tests are failing on 5.6 and 5.8 for now.
This would need investigation before enabling them.

A pre-check is run using the basic ubuntu-latest container
with the system perl. Only on success it's going to
trigger the additional jobs.

Author: atoomic

.github/workflows/testsuite.yml

@@ -0,0 +1,122 @@
+name: testsuite
+
+on:
+  push:
+    branches:
+      - "*"
+    tags-ignore:
+      - "*"
+  pull_request:
+
+jobs:
+  ubuntu:
+    env:
+      PERL_USE_UNSAFE_INC: 0
+      AUTHOR_TESTING: 1
+      AUTOMATED_TESTING: 1
+      RELEASE_TESTING: 1
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: perl -V
+        run: perl -V
+      - name: Makefile.PL
+        run: perl -I$(pwd) Makefile.PL
+      - name: make test
+        run: make test
+
+  linux:
+    name: "linux ${{ matrix.perl-version }}"
+    needs: [ubuntu]
+    env:
+      PERL_USE_UNSAFE_INC: 0
+      AUTHOR_TESTING: 1
+      AUTOMATED_TESTING: 1
+      RELEASE_TESTING: 1
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        perl-version:
+          [
+            "perl:5.32",
+            "perl:5.30",
+            "perl:5.28",
+            "perl:5.26",
+            "perl:5.24",
+            "perl:5.22",
+            "perl:5.20",
+            "perl:5.18",
+            "perl:5.16",
+            "perl:5.14",
+            "perl:5.12",
+            "perl:5.10",
+            "perl:5.8",
+            "perldocker/perl:5.6"
+          ]
+
+    container:
+      image: ${{ matrix.perl-version }}
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: perl -V
+        run: perl -V
+      - name: Makefile.PL
+        run: perl -I$(pwd) Makefile.PL
+      - name: make test
+        run: make test
+
+  macOS:
+    needs: [ubuntu]
+    env:
+      PERL_USE_UNSAFE_INC: 0
+      AUTHOR_TESTING: 1
+      AUTOMATED_TESTING: 1
+      RELEASE_TESTING: 1
+
+    runs-on: macOS-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        perl-version: [latest]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: perl -V
+        run: perl -V
+      - name: Makefile.PL
+        run: perl -I$(pwd) Makefile.PL
+      - name: make test
+        run: make test
+
+  windows:
+    needs: [ubuntu]
+    env:
+      PERL_USE_UNSAFE_INC: 0
+      AUTHOR_TESTING: 0
+      AUTOMATED_TESTING: 1
+      RELEASE_TESTING: 0
+
+    runs-on: windows-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        perl-version: [latest]
+
+    steps:
+      - uses: actions/checkout@master
+      - name: Set up Perl
+        run: |
+          choco install strawberryperl
+          echo "##[add-path]C:\strawberry\c\bin;C:\strawberry\perl\site\bin;C:\strawberry\perl\bin"
+      - name: perl -V
+        run: perl -V
+      - run: perl Makefile.PL
+      - run: make test