Split CI into pre-commit/test/build workflows for branch protection

Branch protection on this repo will require the contexts
ci/woodpecker/pr/pre-commit, ci/woodpecker/pr/test and
ci/woodpecker/pr/build, mirroring the node-lookup workflow layout.

- Adds .woodpecker/pre-commit.yaml running pre-commit via uvx
- Adds .pre-commit-config.yaml mirroring node-lookup (vendored
  web/static assets excluded)
- Adds .woodpecker/test.yaml with vet + gofmt check + race tests
- Reworks build.yaml to compile via make build plus the existing
  buildx dry-run image check, PR events only
- Renames docker.yaml to release.yaml per node-lookup convention
  (tag-driven docker release unchanged)

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+exclude: ^web/static/
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-merge-conflict
+      - id: mixed-line-ending
+        args: [--fix=lf]
+
+  - repo: https://github.com/dnephin/pre-commit-golang
+    rev: v0.5.1
+    hooks:
+      - id: go-fmt
+      - id: go-vet
+      - id: go-unit-tests