move from Travis-CI to GitHub Actions

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: build
+on: [push]
+jobs:
+  Build-Test-Release:
+    runs-on: ubuntu-latest
+    container: tg9541/docker-sdcc:V3.9.0
+    steps:
+      - run: |
+          echo "triggered by: ${{ github.event_name }}"
+          echo "repository:   ${{ github.repository }}"
+          echo "branch name:  ${{ github.ref }}"
+      - name: Check out repository code
+        uses: actions/checkout@v2
+      - name: Build and test
+        run: |
+          make depend
+          echo "; ##########################################" >> forth.asm
+          echo "; # Release info added by GitHub action:"     >> forth.asm
+          echo "; #   repository:   ${{ github.repository }}" >> forth.asm
+          echo "; #   branch name:  ${{ github.ref }}"        >> forth.asm
+          echo "; #   sha:   ${{ github.sha }}"               >> forth.asm
+          echo "; ##########################################" >> forth.asm
+          make release
+          echo "Job status: ${{ job.status }}."
+      - name: GH Release
+        uses: softprops/[email protected]
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            out/stm8ef-bin.zip
+            out/stm8ef-bin.tgz
+            out/stm8ef-rst.tgz
+      - name: Keep non-release binaries
+        uses: softprops/[email protected]
+        if: (! startsWith(github.ref, 'refs/tags/'))
+        with:
+          tag_name: volatile
+          files: |
+            out/stm8ef-bin.zip
+            out/stm8ef-bin.tgz
+            out/stm8ef-rst.tgz
+