RFR: 7411: GPG signing in Github action fails

[Patrick Reinhart]

Signed-off-by: Patrick Reinhart <patrick at reini.net>

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Commit messages:
 - 7411: GPG signing in Github action fails

Changes: https://git.openjdk.java.net/jmc/pull/314/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=314&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7411
  Stats: 14 lines in 2 files changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/314.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/314/head:pull/314

PR: https://git.openjdk.java.net/jmc/pull/314