Squashed 'cde/programs/dtksh/ksh93/' content from commit 66e1d4464

git-subtree-dir: cde/programs/dtksh/ksh93
git-subtree-split: 66e1d44642

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+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: |
+        export TZ=UTC
+        ulimit -n 1024
+        script -q -e -c "bin/shtests"