[WIP] initial conversion to GitHub actions

Initial GH actions usage with (mostly) auto-generated config from circleci conversion tool

TODO:
- use gradle action
- remove circleci config
- why is env package_name added?
- (maybe) japicmp

.github/actions/checkout-and-build/action.yml

@@ -0,0 +1,21 @@
+name: checkout-and-build
+runs:
+  using: composite
+  steps:
+  - uses: actions/[email protected]
+  - run: chmod +x gradlew
+    shell: bash
+  - name: restore_cache
+    uses: actions/[email protected]
+    with:
+      key: v1-dependencies-{{ checksum "build.gradle" }}
+      restore-keys: |-
+        v1-dependencies-{{ checksum "build.gradle" }}
+        v1-dependencies-
+  - run: "./gradlew clean build"
+    shell: bash
+  - name: save_cache
+    uses: actions/[email protected]
+    with:
+      path: "~/.m2"
+      key: v1-dependencies-{{ checksum "build.gradle" }}

.github/actions/run-tests/action.yml

@@ -0,0 +1,10 @@
+name: run-tests
+runs:
+  using: composite
+  steps:
+    - run: "./gradlew check jacocoTestReport --continue --console=plain"
+      shell: bash
+    - uses: codecov/codecov-action@v3
+      with:
+        directory: ./coverage/
+        flags: unittests

.github/workflows/build-and-test.yml

@@ -0,0 +1,25 @@
+name: auth0/auth0-java/build-and-test
+
+on:
+  pull_request:
+  merge_group:
+  push:
+    branches: ["master", "main", "v1"]
+
+# TODO what is the purpose of this?
+env:
+  PACKAGE_NAME: xxxxh0
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: openjdk:8-jdk
+    env:
+      GRADLE_OPTS: -Dorg.gradle.jvmargs="-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError"
+      _JAVA_OPTIONS: "-Xms512m -Xmx1024m"
+      TERM: dumb
+    steps:
+    - uses: actions/[email protected]
+    - uses: "./.github/actions/checkout-and-build"
+    - uses: "./.github/actions/run-tests"