Earthfile: add labels, fix permissions on GitHub's end

Signed-off-by: Xe Iaso <[email protected]>

Author: Xe

Earthfile

@@ -47,6 +47,8 @@ patreon-saasproxy:
 
     CMD ["./patreon-saasproxy"]
 
+    LABEL org.opencontainers.image.source="https://github.com/Xe/site"
+
     SAVE IMAGE --push ghcr.io/xe/site/patreon-saasproxy:earthly
 
 build-xesite:
@@ -70,4 +72,6 @@ xesite:
 
     CMD ["./xesite"]
 
+    LABEL org.opencontainers.image.source="https://github.com/Xe/site"
+
     SAVE IMAGE --push ghcr.io/xe/site/bin:earthly