feat: add CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,94 @@
+name: CI
+on:
+  pull_request:
+  workflow_dispatch:
+
+
+env:
+  DENO_DIR: my_cache_directory
+
+jobs:
+  health:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: denoland/setup-deno@v1
+        with:
+          deno-version: v1.x
+
+      - name: Cache Deno dependencies 
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.DENO_DIR }}
+          key: ${{ hashFiles('lock.json') }}
+
+      - name: Format
+        run: deno fmt --check
+
+      - name: Lint
+        run: deno lint
+
+      - name: Test
+        run: deno test --allow-net=registry.npmjs.org
+
+  working_package:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: denoland/setup-deno@v1
+        with:
+          deno-version: v1.x
+
+      - name: Cache Deno dependencies 
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.DENO_DIR }}
+          key: ${{ hashFiles('lock.json') }}
+
+      - run: |
+          deno run \
+            --allow-net=registry.npmjs.org \
+            --allow-read=. \
+            ./main.ts \
+            fixtures/package_valid.json  \
+            --verbose --cache
+  
+  failing_peer:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: denoland/setup-deno@v1
+        with:
+          deno-version: v1.x
+
+      - name: Cache Deno dependencies 
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.DENO_DIR }}
+          key: ${{ hashFiles('lock.json') }}
+
+      - run: |
+          deno run \
+            --allow-net=registry.npmjs.org \
+            --allow-read=. \
+            ./main.ts \
+            fixtures/package.json  \
+            --verbose --cache
+
+      - name: The job has failed, which is expected
+        if: ${{ failure() }}
+        run: exit 0
+
+      - name: The job has succeeded, which is wrong
+        if: ${{ success() }}
+        run: exit 1
+
+  final:
+    needs: [health, working_package, failing_peer]
+    runs-on: ubuntu-latest
+    steps:
+      - name: "All good"
+        run: exit 0