Switch testing from travis to GHA

.github/workflows/lgm-ci.yml

@@ -0,0 +1,34 @@
+name: lgm-ci
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  basic-suite:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Install dependencies
+      run: |
+        sudo apt-get update -qq
+        sudo apt-get install -y make gcc g++ autotools-dev autoconf
+        sudo apt-get install -y libgsl-dev libgsl23 gsl-bin libgsl-dbg
+        sudo apt-get install -y libhdf5-dev libperl-dev
+        gcc --version
+        gsl-config --version
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: compile_test
+      run: |
+        autoreconf -i
+        ./configure
+        make
+    - name: unit_tests
+      run: |
+        make check