fix: add public mirrors to site scope

containers/jug/dev.Dockerfile

@@ -71,7 +71,7 @@ spack compiler find --scope site
 spack config blame compilers
 EOF
 
-## Setup eics3 buildcache mirrors
+## Setup buildcache mirrors
 ## - this always adds the read-only mirror to the container
 ## - the write-enabled mirror is provided later as a secret mount
 ARG S3_ACCESS_KEY=""
@@ -85,6 +85,8 @@ if [ -n "${S3_ACCESS_KEY}" ] ; then
       --s3-access-key-secret "${S3_SECRET_KEY}"                         \
       eics3 s3://eictest/EPIC/spack/${SPACK_VERSION}
 fi
+spack mirror add --scope site --signed spack-${SPACK_VERSION} https://binaries.spack.io/${SPACK_VERSION}
+spack mirror add --scope site --unsigned ghcr-${SPACK_VERSION} url: oci://ghcr.io/eic/spack-${SPACK_VERSION}
 spack mirror list
 EOF