* implement a core logic to cache dependnecies

* integrate the cache logic to entry points

* add a user doc about the dependency cache feature

* reflect changes to the dist dir

* add a prefix to the cache key

https://github.com/actions/setup-java/pull/193/files#r669521434

* test: extract build.gradle to a file in __tests__ dir

* run the restore e2e test on the specified OS

* add an e2e test for maven

* fix the dependency among workflows

* stabilize the cache on the Windows in e2e test

* add .gitignore files to __tests__/cache directories

* try to run restore after the authentication

* use the key in state to save caches in the post process

* suggest users to run without daemon if fail to save Gradle cache on Windows

* add missing description in the README.md

* run clean-up tasks in serial

* Add validation for post step (actions#3)

* work on fixing cache post step

* fix tests

* Update src/cleanup-java.ts

Co-authored-by: Konrad Pabjan <konradpabjan@github.com>

* Update src/cache.ts

Co-authored-by: Konrad Pabjan <konradpabjan@github.com>

* style: put the name of input to the constants.ts

* format: run `npm run build` to reflect changes to the dist dir

* chore: update licensed files by `licensed cache`

it still has three errors as follows:
>* setup-java.npm.sax
>  filename: /Users/kengo/GitHub/setup-java/.licenses/npm/sax.dep.yml
>    - license needs review: other
>
>* setup-java.npm.tslib-1.14.1
>  filename: /Users/kengo/GitHub/setup-java/.licenses/npm/tslib-1.14.1.dep.yml
>    - license needs review: 0bsd
>
>* setup-java.npm.tslib-2.3.0
>  filename: /Users/kengo/GitHub/setup-java/.licenses/npm/tslib-2.3.0.dep.yml
>    - license needs review: 0bsd

* fix: rerun ncc on macOS with node v12

* build: follow the suggestion at PR page

actions#193 (comment)

* fix: throw error in case of no package manager file found

Co-authored-by: Dmitry Shibanov <dmitry-shibanov@github.com>
Co-authored-by: Konrad Pabjan <konradpabjan@github.com>