chore: migrate from Circle to GHA (#56)

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/actionlint.yml

@@ -0,0 +1,13 @@
+name: Lint GitHub Actions Workflows
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+      - name: 'Check workflow files'
+        uses: docker://rhysd/actionlint:1.6.23

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: Test
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  node_test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+      - id: npm-cache-dir
+        run: echo "dir=$(npm config get cache)" >> "$GITHUB_OUTPUT"
+      - uses: actions/cache@69d9d449aced6a2ede0bc19182fadc3a0a42d2b0 # v3.2.6
+        with:
+          path: '${{ steps.npm-cache-dir.outputs.dir }}'
+          key: "${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}"
+          restore-keys: '${{ runner.os }}-node-'
+      - run: npm ci
+      - run: npm run test

CODEOWNERS

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+@hashicorp/web-platform