ci: skip automatic test environment precompile

Author: bernalde

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    env:
+      # Pkg.test otherwise precompiles the entire transitive SciML environment.
+      JULIA_PKG_PRECOMPILE_AUTO: "0"
     strategy:
       fail-fast: false
       matrix: