Adding docs build, project build, and tox CI workflows

.riahub/workflows/build-docs.yaml

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+name: Build Docs
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+       - uses: actions/checkout@v4
+       - uses: ammaraskar/sphinx-action@0.4
+         with:
+          docs-folder: "docs/"
+          pre-build-command: pip install -U sphinx sphinx-rtd-theme

.riahub/workflows/build-project.yaml

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+name: Build Project
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  project-build-check:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.10', '3.11', '3.12' ]
+
+    name: Build Project
+    steps:
+      - name: Check out project
+        uses: actions/checkout@v4
+
+      - name: Build project
+        run: |
+          poetry build
+
+      - name: Set up Python environment
+        uses:  actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Create Python virtual environment
+        run: |
+          python -m venv .venv
+
+      - name: Install project in virtual environment
+        run: |
+          source .venv/bin/activate
+          pip install dist/*.whl
+
+      # In the following step, 'pip list' prints out a list of installed dependencies. This is not required for the
+      #  build but useful for debugging.
+      - name: Check dependency installation
+        run: |
+          source .venv/bin/activate
+          pip check
+          pip list
+
+      - name: Very project import
+        run: |
+          source .venv/bin/activate
+          python -c "import ria_toolkit"

.riahub/workflows/tox.yaml

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+name: Test with tox
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
+    name: Test with tox
+    steps:
+      - name: Check out project
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox-gh-actions
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install tox tox-gh-actions
+
+      - name: Test with tox
+        run:  |
+          tox