Switch from Travis CI to GitHub Actions

Travis have been slow and the macOS runner is outdated (and a bunch of
other recurring issues).

.github/workflows/main.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        flavor: [arch, debian, fedora, tumbleweed, ubuntu]
+
+    name: Linux
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run tests
+        run: |
+          docker build -f Dockerfile.${{ matrix.flavor }} -t profanity .
+          docker run profanity ./ci-build.sh
+
+  macos:
+    runs-on: macos-latest
+    name: macOS
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run brew bundle
+        run: brew bundle
+      - name: Run tests
+        env:
+          # Ensure that "keg-only" Homebrew versions are used.
+          PKG_CONFIG_PATH: "/usr/local/opt/ncurses/lib/pkgconfig:/usr/local/opt/expat/lib/pkgconfig:/usr/local/opt/curl/lib/pkgconfig:/usr/local/opt/openssl/lib/pkgconfig:/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/sqlite/lib/pkgconfig:$PKG_CONFIG_PATH"
+        run: ./ci-build.sh

.travis.yml

@@ -1,58 +0,0 @@
-dist: bionic
-language: bash
-
-services:
-  - docker # Linux tests are run in Docker containers.
-
-addons:
-  homebrew:
-    brewfile: Brewfile.travis # mac OS dependencies.
-    # libsignal-protocol-c is still not in the Travis CI Homebrew snapshot, the
-    # line below could be removed when the snapshot has been updated to speed up
-    # the OSX job.
-    update: true
-
-matrix:
-  include:
-    - os: linux
-      env: BUILD_FLAVOR=tumbleweed
-#    - os: linux
-#      env: BUILD_FLAVOR=debian
-#    - os: linux
-#      env: BUILD_FLAVOR=ubuntu
-    - os: linux
-      env: BUILD_FLAVOR=arch
-#    - os: linux
-#      env: BUILD_FLAVOR=fedora
-#    - os: osx
-#      env:
-        # Ensure that "keg-only" Homebrew versions are used.
-#        - PKG_CONFIG_PATH="/usr/local/opt/ncurses/lib/pkgconfig:$PKG_CONFIG_PATH"
-#        - PKG_CONFIG_PATH="/usr/local/opt/expat/lib/pkgconfig:$PKG_CONFIG_PATH"
-#        - PKG_CONFIG_PATH="/usr/local/opt/curl/lib/pkgconfig:$PKG_CONFIG_PATH"
-#        - PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig:$PKG_CONFIG_PATH"
-#        - PKG_CONFIG_PATH="/usr/local/opt/libffi/lib/pkgconfig:$PKG_CONFIG_PATH"
-#        - PKG_CONFIG_PATH="/usr/local/opt/sqlite/lib/pkgconfig:$PKG_CONFIG_PATH"
-
-before_install:
-  - >
-    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-      # Ensure that Travis uses the latest version of Docker.
-      curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
-      sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
-      sudo apt-get update
-      sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
-      docker build -f Dockerfile."$BUILD_FLAVOR" -t profanity .
-    fi
-
-script:
-  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-    docker run -it profanity ./ci-build.sh;
-    fi
-  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then
-    ./ci-build.sh;
-    fi
-
-after_failure:
-  - cat ./config.log
-  - env