ci: Modernize dev tooling and add workflows

.github/dependabot.yml

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+version: 2
+updates:
+  # Go modules
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      go-dependencies:
+        patterns:
+          - "*"
+
+  # GitHub Actions used in workflows
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/pull_request_template.md

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+### Related Issues
+
+- fixes #issue-number
+
+### Proposed Changes:
+
+ <!--- In case of a bug: Describe what caused the issue and how you solved it -->
+ <!--- In case of a feature: Describe what did you add and how it works -->
+
+### How did you test it?
+
+<!-- unit tests, integration tests, manual verification, instructions for manual tests -->
+
+### Notes for the reviewer
+
+<!-- E.g. point out a section where the reviewer should focus. -->
+
+### Checklist
+
+- [ ] Code is formatted (`make fmt-check`)
+- [ ] Linting passes, incl. gosec and misspell (`make lint`)
+- [ ] Static analysis passes (`make vet`)
+- [ ] No new dependency vulnerabilities (`make vuln`)
+- [ ] Tests pass, and I added/updated tests for my changes (`make test`)
+- [ ] The full quality gate passes locally (`make verify`)
+- [ ] I have updated the related issue with new insights and changes
+- [ ] I documented exported identifiers with godoc comments
+- [ ] I've used one of the [conventional commit types](https://www.conventionalcommits.org/en/v1.0.0/) for my PR title: `fix:`, `feat:`, `build:`, `chore:`, `ci:`, `docs:`, `style:`, `refactor:`, `perf:`, `test:`.

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  verify:
+    name: Verify
+    runs-on: ubuntu-latest
+
+    services:
+      mysql:
+        image: mysql:8.4
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: ethblocks_test
+          MYSQL_USER: ethblocks_test
+          MYSQL_PASSWORD: ethblocks_test
+        ports:
+          - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping -h 127.0.0.1 -uroot -proot"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=10
+
+    env:
+      ETHBLOCKS_DB: mysql
+      ETHBLOCKS_DBPASSROOT: root
+      ETHBLOCKS_DBUSER_TEST: ethblocks_test
+      ETHBLOCKS_DBPASS_TEST: ethblocks_test
+      ETHBLOCKS_DBHOST: 127.0.0.1
+      ETHBLOCKS_DBPORT: 3306
+      ETHBLOCKS_DBNAME_TEST: ethblocks_test
+      ETHBLOCKS_CLIENT: https://ethereum-rpc.publicnode.com
+      GOLANGCI_LINT_VERSION: v2.12.2
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Verify modules
+        run: make mod-verify
+
+      - name: Check formatting
+        run: make fmt-check
+
+      - name: Lint
+        run: make lint
+
+      - name: Vet
+        run: make vet
+
+      - name: Vulnerability scan
+        run: make vuln
+
+      - name: Test
+        run: make test
+
+      - name: Build
+        run: make build
+
+      - name: Upload coverage artifact
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage
+          path: coverage.out
+          if-no-files-found: ignore