feat: Add CI, fix TS errors, apply prettier

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+name: "test"
+
+on: pull_request
+
+jobs:
+  build: # make sure build/ci work properly
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-node@v2
+      with:
+        cache: yarn
+
+    - run: yarn
+
+    - name: lint
+      run: |
+        yarn lint
+        yarn format-check
+
+    - name: build
+      run: yarn build
+
+    - name: Integration test - get token
+      id: my-app
+      uses: ./
+      with:
+        app_id: ${{ secrets.INTEGRATION_TEST_APP_ID }}
+        private_key: ${{ secrets.INTEGRATION_TEST_APP_PRIVATE_KEY }}
+
+    - name: Integration test - checkout private repo
+      uses: actions/checkout@v2
+      with:
+        repository: getsentry/action-github-app-token-test
+        token: ${{ steps.my-app.outputs.token }}

README.md

@@ -12,7 +12,7 @@ $ yarn
 
 Build the typescript and package it for distribution
 ```bash
-$ yarn build
+$ yarn dist
 ```
 
 ## Usage