RFR: 8354337: GHA: Windows build fails with chmod permission error [v2]

[Kevin Rushforth]

> After a recent update by GitHub to the GHA Windows Server 2022 runner, we get the following error in all GHA test runs:
> 
> 
> chmod: changing permissions of '.': Permission denied
> chmod: changing permissions of './bin': Permission denied 
> ...
> 
> 
> This PR disables running `chmod -R` on the `artifacts/sdk` dir when doing a GHA build.
> 
> The `chmod` is only needed when building artifacts for distribution, and we only use the GHA build for sanity testing, so we can avoid this problem by adding a flag that skips the `chmod` if running on GHA. This is a minimally intrusive solution that would restore our ability to run GHA test builds on Windows without affecting the actual JavaFX build.
> 
> I've run a CI build as well as a local build to ensure that the chmod is still being executed.

Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:

  Review comments

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1770/files
  - new: https://git.openjdk.org/jfx/pull/1770/files/3b724639..d277005c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1770&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1770&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1770.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1770/head:pull/1770

PR: https://git.openjdk.org/jfx/pull/1770