Add woodpecker CI

.woodpecker/.build.yml

@@ -0,0 +1,12 @@
+pipeline:
+  run:
+    image: gradle:7.5-jdk8
+    commands:
+      - git checkout $CI_COMMIT_BRANCH
+      # Code works
+      - gradle test
+      # Code is clean
+      - gradle check javadocAll
+      # Code has coverage
+      - gradle jacocoRootReport coveralls
+    secrets: [COVERALLS_REPO_TOKEN]

.woodpecker/.reuse.yml

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+# Code is licensed properly
+# See https://reuse.software/
+pipeline:
+  reuse:
+    image: fsfe/reuse:latest
+    commands:
+      - reuse lint