chore: add CI, dependabot, and release workflow

.github/dependabot.yml

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+version: 2
+updates:
+  # go modules -- one grouped PR for everything
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      go-deps:
+        patterns: ["*"]
+
+  # dockerfile base images (golang, alpine)
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: weekly
+
+  # the workflow actions themselves
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/ci.yml

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+name: ci
+on:
+  push:
+    branches: [main]
+  pull_request:
+permissions:
+  contents: read
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis:alpine
+        ports:
+          - 6379:6379
+    env:
+      TEST_REDIS_ADDR: localhost:6379
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - run: go build ./...
+      - run: go vet ./...
+      - run: go test ./...
+  vuln:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - uses: golang/govulncheck-action@v1
+        with:
+          go-version-file: go.mod

.github/workflows/release.yml

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+# rolling :latest image, published manually from the Actions tab (Run workflow)
+name: release
+on:
+  workflow_dispatch:
+permissions:
+  contents: read
+  packages: write
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/parkan/go-hauk:latest
+            ghcr.io/parkan/go-hauk:${{ github.sha }}