Use eager Pkg server registry instead of git cloning

Author: fredrikekre

action.yml

@@ -17,17 +17,12 @@ inputs:
 runs:
   using: 'composite'
   steps:
-    # Occasionally, there are rather large delays (> a few hours)
-    # between the time a package is registered in General and
-    # propagated to pkg.julialang.org.  We can avoid this by manually
-    # cloning ~/.julia/registries/General/ in Julia 1.5 and later.
-    # See:
-    # * https://github.com/JuliaLang/Pkg.jl/issues/2011
-    # * https://github.com/JuliaRegistries/General/issues/16777
-    # * https://github.com/JuliaPackaging/PkgServer.jl/issues/60
-  - run: julia --color=yes "$GITHUB_ACTION_PATH"/add_general_registry.buildpkg.jl
-    shell: bash
-
+    - run: |
+        VERSION >= v"1.5-" || return
+        ENV["JULIA_PKG_SERVER_REGISTRY_PREFERENCE"] = get(ENV, "JULIA_PKG_SERVER_REGISTRY_PREFERENCE", "eager")
+        import Pkg
+        Pkg.Registry.add("General")
+      shell: julia {0}
   - run: julia --color=yes --project=${{ inputs.project }} -e 'using Pkg; if VERSION >= v"1.1.0-rc1"; Pkg.build(verbose=true); else Pkg.build(); end'
     shell: bash
     env: