RFR: 8264010: Add Gradle dependency verification

[Kevin Rushforth]

On Tue, 23 Mar 2021 05:32:04 GMT, John Neffenger <jgneff at openjdk.org> wrote:

> This pull request adds dependency verification to the Gradle builds of JavaFX on Linux, macOS, and Windows. It is the third of three changes that close the gaps in the JavaFX build security:
> 
> * [JDK-8262236][1]: Configure Gradle checksum verification
> * [JDK-8263204][2]: Add Gradle Wrapper Validation Action
> * [JDK-8264010][3]: Add Gradle dependency verification
> 
> "Without dependency verification it's easy for an attacker to compromise your supply chain," warns the [Gradle User Guide][4]. All three changes come from conference talks by members of the Gradle team, available as [PDF slides][5] or on YouTube in the following two videos:
> 
> * [Cédric Champeau at Devoxx][6] in November 2019
> * [Louis Jacomet at Jfokus][7] in February 2020
> 
> "We all run in a crazy-unsafe environment," says Louis Jacomet at the end of his talk. These three changes make it just a little less crazy-unsafe for all of us building JavaFX, regardless of our system, network, or country.
> 
> [1]: https://bugs.openjdk.java.net/browse/JDK-8262236
> [2]: https://bugs.openjdk.java.net/browse/JDK-8263204
> [3]: https://bugs.openjdk.java.net/browse/JDK-8264010
> 
> [4]: https://docs.gradle.org/current/userguide/dependency_verification.html
> [5]: https://www.jfokus.se/jfokus20-preso/Protecting-your-organization-against-attacks-via-the-build-system.pdf
> [6]: https://youtu.be/GWGNp3a3hpk
> [7]: https://youtu.be/bwiafNatsf0

This seems like a good idea to do. I have a couple overall questions before reviewing / testing.

1. Can you add some sort of README file that describes the how to update the checksums? Also, the instructions in [UPDATING-lucene.txt](https://github.com/openjdk/jfx/blob/master/apps/samples/Ensemble8/UPDATING-lucene.txt) should be updated accordingly.
2. Some of the files listed are not used directly. I presume that you added them because they are used indirectly by other components? Are all of them actually needed?

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PR: https://git.openjdk.java.net/jfx/pull/437