Precompilation statements for nightly (#4082)

* enable precompilation on nightly

* update CompileBot, add precompile statements for nightly

Author: t-bltg

.github/workflows/CompileBot.yml renamed to .github/workflows/SnoopCompile.yml

@@ -1,4 +1,6 @@
-name: CompileBot
+# NOTE: this file should be named 'SnoopCompile.yml', cf github.com/aminya/CompileBot.jl/blob/master/src/CompileBot.jl#L57
+
+name: SnoopCompile
 
 on:
   push:
@@ -21,8 +23,10 @@ jobs:
       fail-fast: false
       matrix:
         version:   # NOTE: the versions below should match those in your botconfig
-          - '1.6'  # ⎤
-          - '1.7'  # ⎦ <<< keep these versions in sync with deps/SnoopCompile/snoop_bot_config.jl
+          - '1.6'       # ⎤
+          - '1.7'       # |
+          - 'nightly'   # ⎦ <<< keep these versions in sync with deps/SnoopCompile/snoop_bot_config.jl
+          # ^^^^^^^^^ for 'nightly', see github.com/JuliaPlots/Plots.jl/issues/4079
         os:        # NOTE: should match the os setting of your botconfig
           - ubuntu-latest
         arch: