Improve repository.

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

.github/workflows/codeql.yaml

@@ -0,0 +1,27 @@
+name: CodeQL
+
+"on":
+  workflow_dispatch: {}
+  push:
+    branches: [main]
+    paths: [src/main/java/*.java]
+  pull_request:
+    branches: [main]
+    paths: [src/main/java/*.java]
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  codeql:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+    steps:
+      - uses: actions/checkout@v2
+      - uses: github/codeql-action/init@v1
+        with:
+          languages: java
+      - uses: github/codeql-action/autobuild@v1
+      - uses: github/codeql-action/analyze@v1

.github/workflows/release.yaml

@@ -20,6 +20,7 @@ jobs:
         with:
           distribution: temurin
           java-version: 11
+          cache: maven
           server-id: sonatype-nexus
           server-username: SERVER_USERNAME
           server-password: SERVER_PASSWORD

.github/workflows/snapshot.yaml

@@ -6,7 +6,7 @@ name: Snapshot
 
 jobs:
 
-  lint-yaml:
+  yaml:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -15,7 +15,7 @@ jobs:
           format: colored
           strict: true
 
-  lint-markdown:
+  markdown:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -47,7 +47,7 @@ jobs:
         if: failure()
         with:
           name: surefire
-          path: '*/target/surefire-reports/*.xml'
+          path: '**/target/surefire-reports/*.xml'
           reporter: java-junit
           list-suites: failed
           list-tests: failed