ci: add github actions ci

Former-commit-id: 75441a90a8

.github/workflows/ci.yaml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on: [push, pull_request]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [macos-latest, ubuntu-latest]
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+
+    # Runs a single command using the runners shell
+    - name: Install prerequisites
+      shell: bash
+      run: |
+        if [[ "${{ matrix.os }}" =~ "macos.*" ]]; then
+          brew install fish zsh
+        elif [[ "${{ matrix.os }}" =~ "ubuntu.*" ]]; then
+          sudo apt -y update
+          sudo apt -y install fish zsh
+        fi
+
+    # Runs a set of commands using the runners shell
+    - name: Test sourcing
+      run: |
+        bash forgit.plugin.sh
+        zsh  forgit.plugin.zsh
+        fish forgit.plugin.fish

.gitignore

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+._zinit/
+*.zwc