Continous integration builds using Github actions (#36)

* Configuration for continous integration builds using Github actions
for Linux and MacOS.

* Enable tests during CI build

* Updated CI step labels

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on: [push]
+
+jobs:
+
+  Linux:
+    name: Linux
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Build
+      run: bin/package make
+    - name: Regression tests
+      run: bin/shtests
+
+  MacOS:
+    name: MacOS
+    runs-on: macos-latest
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Build
+      run: bin/package make
+    - name: Regression tests
+      run: bin/shtests

README.md

@@ -1,3 +1,5 @@
+![](https://github.com/ksh93/ksh/workflows/CI/badge.svg)
+
 # KornShell 93u+m
 
 This repository is used to develop bugfixes