disable multithreading, first make caches in WignerSymbols and SUNRepresentations threadsafe

Author: Jutho

Diff for: .github/workflows/ci-julia-nightly.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
         env:
-          JULIA_NUM_THREADS: 2
+          # JULIA_NUM_THREADS: 2
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with:

Diff for: .github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
         env:
-          JULIA_NUM_THREADS: 2
+          # JULIA_NUM_THREADS: 2
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with:

Diff for: README.md

@@ -4,16 +4,19 @@ A Julia package for large-scale tensor computations, with a hint of category the
 
 | **Documentation**                                                               | **Build Status**                                                                                |
 |:-------------------------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------:|
-| [![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] | [![CI][github-img]][github-url] [![][codecov-img]][codecov-url] |
+| [![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] | [![CI][ci-img]][ci-url] [![CI (Julia nightly)][ci-julia-nightly-img]][ci-julia-nightly-url] [![][codecov-img]][codecov-url] |
 
 [docs-dev-img]: https://img.shields.io/badge/docs-dev-blue.svg
 [docs-dev-url]: https://jutho.github.io/TensorKit.jl/latest
 
 [docs-stable-img]: https://img.shields.io/badge/docs-stable-blue.svg
 [docs-stable-url]: https://jutho.github.io/TensorKit.jl/stable
 
-[github-img]: https://github.com/Jutho/TensorKit.jl/workflows/CI/badge.svg
-[github-url]: https://github.com/Jutho/TensorKit.jl/actions?query=workflow%3ACI
+[ci-img]: https://github.com/Jutho/TensorKit.jl/workflows/CI/badge.svg
+[ci-url]: https://github.com/Jutho/TensorKit.jl/actions?query=workflow%3ACI
+
+[ci-julia-nightly-img]: https://github.com/Jutho/TensorKit.jl/workflows/CI%20(Julia%20nightly)/badge.svg
+[ci-julia-nightly-url]: https://github.com/Jutho/TensorKit.jl/actions?query=workflow%3A%22CI+%28Julia+nightly%29%22
 
 [codecov-img]: https://codecov.io/gh/Jutho/TensorKit.jl/branch/master/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/Jutho/TensorKit.jl