fix: pass social media secrets to release job for JReleaser announce

[chloe41427]

Problem

The release job in release.yml runs jreleaser release which includes the announce phase, but the Bluesky and Mastodon secrets are not mapped as environment variables. This causes JReleaser validation to fail:

[ERROR] announce.bluesky.handle must not be blank
[ERROR] announce.bluesky.password must not be blank
[ERROR] announce.mastodon.accessToken must not be blank

Fix

Add JRELEASER_MASTODON_ACCESS_TOKEN, JRELEASER_BLUESKY_HANDLE, and JRELEASER_BLUESKY_PASSWORD to the release step env, matching the pattern already used in promote.yml.

Note

Requires repo secrets MASTODON_ACCESS_TOKEN, BLUESKY_HANDLE, and BLUESKY_PASSWORD to be set (same ones used by promote workflow).