Add Architectures tag to support multiple architectures

Signed-off-by: Odidev <[email protected]>

library/mediawiki

@@ -3,6 +3,7 @@ Maintainers: David Barratt <[email protected]> (@davidbarratt),
              addshore <[email protected]> (@addshore)
 GitRepo: https://github.com/wikimedia/mediawiki-docker.git
 GitCommit: 2dea40647eb85d6e0fc607904e0779644cf869c9
+Architectures: amd64, arm64v8
 
 Tags: stable, latest, 1.31, 1.31.0
 Directory: stable