Improve repository.

- add kokuwa checkstyle
- add dependabot
- add dependency documentation
- add code owners
- add codeql
- add license badge

.github/workflows/snapshot.yaml

@@ -2,32 +2,16 @@ name: Snapshot
 
 "on":
   workflow_dispatch: {}
-  push: {}
+  push:
+    branches: [main]
+    paths-ignore: ['**.md']
 
 jobs:
-
-  lint-yaml:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: ibiqlik/action-yamllint@v3
-        with:
-          format: colored
-          strict: true
-
-  lint-markdown:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: docker://avtodev/markdown-lint:v1
-        with:
-          args: /github/workspace
-
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-java@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
         with:
           distribution: temurin
           java-version: 11
@@ -35,19 +19,17 @@ jobs:
           server-id: sonatype-nexus
           server-username: SERVER_USERNAME
           server-password: SERVER_PASSWORD
-      - run: mvn -B dependency:go-offline -q
-      - run: mvn -B verify
-        if: github.ref != 'refs/heads/main'
+      - run: mvn -B dependency:go-offline
       - run: mvn -B deploy
-        if: github.ref == 'refs/heads/main'
         env:
           SERVER_USERNAME: ${{ secrets.SONATYPE_NEXUS_USERNAME }}
           SERVER_PASSWORD: ${{ secrets.SONATYPE_NEXUS_PASSWORD }}
-      - uses: dorny/test-reporter@v1
+      - uses: dorny/test-reporter@v1.5.0
         if: failure()
         with:
           name: surefire
-          path: '*/target/surefire-reports/*.xml'
+          path: '**/target/surefire-reports/*.xml'
           reporter: java-junit
           list-suites: failed
           list-tests: failed
+          fail-on-error: false