Checking all hashes is a bit violent to find the compilers

.gitlab-ci.yml

@@ -155,8 +155,8 @@ spack:install_compilers:
     - |
       while read -r compiler_hash
       do
-        spack/bin/spack compiler find --scope system $(spack/bin/spack location -i /${compiler_hash})
-      done <<< $(echo "${hashes}")
+        spack/bin/spack compiler find --scope system $(spack/bin/spack location -i ${compiler_hash})
+      done <<< $(echo ${hashes})
 
     - spack/bin/spack -e . config compilers