Add unit-test and lint woodpecker pipelines for pull requests

Also move .woodpecker.yaml into .woodpecker/release.yaml for consistency.

.woodpecker/lint.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: lint
+    image: golangci/golangci-lint:latest
+    commands:
+      - golangci-lint run ./...

.woodpecker/pre-commit.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: pre-commit
+    image: git.unkin.net/unkin/almalinux9-base:20260308
+    commands:
+      - uvx pre-commit run --all-files

.woodpecker/unit-tests.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: unit-tests
+    image: golang:latest
+    commands:
+      - go test -v -race ./...