set up GitHub Actions CI; remove .travis.yml; cleanups (#185)

.github/workflows/main.yml

@@ -0,0 +1,41 @@
+name: main
+
+defaults:
+  run:
+    shell: bash
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: '0 13 * * 4'
+
+jobs:
+  strategy:
+    matrix:
+      platform: [ubuntu-latest, macos-12, macos-14, windows-latest]
+    fail-fast: false
+  runs-on: ${{ matrix.platform }}
+  steps:
+    - uses: actions/checkout@v4.1.1
+    - uses: jwlawson/actions-setup-cmake@v1.13
+    - run: | 
+        mkdir build
+        cd build
+        cmake $CMAKE_ARGS -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DBUILD_DOC=ON -DBUILD_TESTING=ON -DDISABLE_REFMAN_PDF=ON ..
+        make lib 
+  
+    - run: |
+        cd build
+        export CTEST_OUTPUT_ON_FAILURE=1
+        make check-testsuite     # Build and check the testsuite
+        make check-examples      # Build and check the examples
+        # TODO! (fails with error: no such file or directory: 'arrdaxpyf.o')
+        # - make check-benchmarks    # Build and check the benchmarks (takes a long time)
+        make blitz-doc
+        sudo make install        # Install Blitz++
+
+        # TODO: LD_LIBRARY_PATH=/usr/local/lib ${srcdir}/travis-ci/check-wiki-examples.py
+

README.md

@@ -1,5 +1,5 @@
-[![Build Status](https://travis-ci.org/blitzpp/blitz.svg?branch=master)](https://travis-ci.org/blitzpp/blitz)
-[![Windows Build status](http://ci.appveyor.com/api/projects/status/github/blitzpp/blitz?branch=master&svg=true)](https://ci.appveyor.com/project/blitzpp/blitz/branch/master)
+[![Github Actions Build Status](https://github.com/blitzpp/blitz/workflows/main/badge.svg?branch=main)](https://github.com/blitzpp/blitz/actions)
+[![Windows Build status](http://ci.appveyor.com/api/projects/status/github/blitzpp/blitz?branch=main&svg=true)](https://ci.appveyor.com/project/blitzpp/blitz/branch/main)
 
 # IMPORTANT NOTICE