v0.3.0

Changelog

• 14003eb: Add version/tag to release plan; set workflow shell (@sonquer)

Verify what you downloaded:

sha256sum --check checksums.txt --ignore-missing

cosign verify-blob checksums.txt \
  --certificate checksums.txt.pem \
  --signature checksums.txt.sig \
  --certificate-identity-regexp 'https://github\.com/apptivitypl/gopage/\.github/workflows/publish\.yml@refs/heads/main' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com