chore: add github workflow

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @codingki @NotJeremyLiu

.github/workflows/tests.yml

@@ -0,0 +1,55 @@
+name: Tests
+on: [pull_request, push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Use Node 18.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Generate cosmjs types
+        run: npm run codegen
+        working-directory: ./packages/core
+
+      - name: Test
+        run: npm test
+
+  e2e-tests:
+    runs-on: ubuntu-latest-m
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Use Node 18.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: Install dependencies
+        run: npm ci
+        working-directory: ./packages/core
+
+      - name: Generate cosmjs types
+        run: npm run codegen
+        working-directory: ./packages/core
+
+      - name: Setup starship
+        run: npm run e2e:setup HELM_FILE=starship/ci.yaml
+        working-directory: ./packages/core
+
+      - name: Start starship
+        run: make start HELM_FILE=starship/ci.yaml
+        working-directory: ./packages/core
+
+      - name: Run e2e tests
+        run: npm run e2e:test
+        working-directory: ./packages/core