Remove run-id from cache key

Author: PProfizi

.github/workflows/docs.yml

@@ -126,10 +126,9 @@ jobs:
           # Cache key is composed of branch name, ansys version, hash of requirements_doc,
           # and run_id to work around immutability
           # We should also track version of pandoc, of graphviz, of packages installed by headless-display, and even of pydpf-core?
-          key: doc-build-${{ github.ref_name }}-DPF_${{inputs.ANSYS_VERSION}}${{inputs.standalone_suffix}}-${{hashfiles('requirements/requirements_docs.txt')}}-${{ github.run_id }}
+          key: doc-build-${{ github.ref_name }}-DPF_${{inputs.ANSYS_VERSION}}${{inputs.standalone_suffix}}-${{hashfiles('requirements/requirements_docs.txt')}}
           restore-keys: |
-            doc-build-${{ github.ref_name }}-DPF_${{inputs.ANSYS_VERSION}}${{inputs.standalone_suffix}}-${{hashfiles('requirements/requirements_docs.txt')}}-
-            doc-build-master-DPF_${{inputs.ANSYS_VERSION}}${{inputs.standalone_suffix}}-${{hashfiles('requirements/requirements_docs.txt')}}-
+            doc-build-master-DPF_${{inputs.ANSYS_VERSION}}${{inputs.standalone_suffix}}-${{hashfiles('requirements/requirements_docs.txt')}}
 
       - name: "Build HTML Documentation"
         shell: bash