Seperated doc build job

.github/workflows/doc_build.yml

+name: Doc-Build-Upload
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  Build-Docs:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -el {0}
+    steps:
+      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+        with:
+          submodules: true
+          fetch-depth: 0
+      - uses: conda-incubator/setup-miniconda@3b0f2504dd76ef23b6d31f291f4913fb60ab5ff3
+        with:
+          miniconda-version: "latest"
+          activate-environment: usgscsm
+          environment-file: doc_environment.yml
+          auto-activate-base: false
+          auto-update-conda: true
+
+      - name: Check doc build environment
+        run: |
+          conda list
+
+      - name: Build Docs
+        run: |
+          cd docs
+          doxygen Doxyfile.in
+          sphinx-build -b html source public
+
+      - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce
+        with:
+          name: docs_folder
+          path: docs/public/
\ No newline at end of file