Add GitHub actions workflow

.github/workflows/main.yml

@@ -0,0 +1,31 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+
+  workflow_dispatch:
+
+
+jobs:
+  bootstrap:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run bootstrap
+        run: make bootstrap
+        env:
+          DOTFILES_CI: 1
+  create-key:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run key creation
+        run: echo "test\n\n" | make create_personal_ssh_github_key
+        env:
+          DOTFILES_CI: 1