add ci stuff

Author: mallardduck

.github/dependabot.yml

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+version: 2
+updates:
+  # Go modules
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"
+      - "go"
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "github-actions"
+    commit-message:
+      prefix: "chore"
+      include: "scope"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: '1.24'
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          version: latest
+          args: --timeout=5m
+
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go-version: ['1.24']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Download dependencies
+        run: go mod download
+
+      - name: Run tests
+        shell: bash
+        run: go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+
+      - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.24'
+        uses: codecov/codecov-action@v5
+        with:
+          slug: mallardduck/go-http-helpers
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.out
+          flags: unittests
+          fail_ci_if_error: false

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  test:
+    name: Test before release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: '1.24'
+
+      - name: Run tests
+        run: go test -v -race ./...