Fix build version in Docker.

Signed-off-by: Odyssey <odyssey346@disroot.org>

.woodpecker.yml

@@ -5,7 +5,7 @@ pipeline:
         image: golang:1.19.3-alpine
         commands:
             -  go mod download
-            -  go build .
+            -  go build -ldflags "-X codeberg.org/gothub/gothub/pages.Version=${CI_COMMIT_SHA:0:8}"
     dockerize:
         when:
             branch: [main, master]