Added gh actions

.github/actions/download-artifact/action.yml

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+name: Download artifact
+description: Wrapper around GitHub's official action, with additional extraction before download
+
+# https://github.com/actions/download-artifact/blob/main/action.yml
+inputs:
+  name:
+    description: Artifact name
+    required: true
+  path:
+    description: Destination path
+    required: false
+    default: .
+
+runs:
+  using: composite
+  steps:
+    - name: Download artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: ${{ inputs.name }}
+        path: ${{ inputs.path }}
+
+    - name: Extract artifacts
+      run: tar -xvf ${{ inputs.name }}.tar
+      shell: bash
+      working-directory: ${{ inputs.path }}
+
+    - name: Remove archive
+      run: rm -f ${{ inputs.name }}.tar
+      shell: bash
+      working-directory: ${{ inputs.path }}

.github/actions/upload-artifact/action.yml

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+name: Upload artifact
+description: Wrapper around GitHub's official action, with additional archiving before upload
+
+# https://github.com/actions/upload-artifact/blob/main/action.yml
+inputs:
+  name:
+    description: Artifact name
+    required: true
+  path:
+    description: One or more files, directories or wildcard pattern that describes what to upload
+    required: true
+  if-no-files-found:
+    description: >
+      The desired behavior if no files are found using the provided path.
+      Available Options:
+        warn: Output a warning but do not fail the action
+        error: Fail the action with an error message
+        ignore: Do not output any warnings or errors, the action does not fail
+    required: false
+    default: warn
+  retention-days:
+    description: >
+      Duration after which artifact will expire in days. 0 means using default retention.
+      Minimum 1 day.
+      Maximum 90 days unless changed from the repository settings page.
+    required: false
+    default: '0'
+
+runs:
+  using: composite
+  steps:
+    - name: Archive artifacts
+      run: tar -hcvf ${{ inputs.name }}.tar $(echo "${{ inputs.path }}" | tr '\n' ' ')
+      shell: bash
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        if-no-files-found: ${{ inputs.if-no-files-found }}
+        name: ${{ inputs.name }}
+        path: ${{ inputs.name }}.tar
+        retention-days: ${{ inputs.retention-days }}
+
+    - name: Remove archive
+      run: rm -f ${{ inputs.name }}.tar
+      shell: bash

.github/workflows/deployment.yml

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+name: Deploy
+
+on:
+    # Triggers the workflow on push or pull request events but only for the main branch
+    push:
+        branches: [main, release**]
+    pull_request:
+        branches: [main, release**]
+        # Don't run on draft PR's, see: https://github.com/orgs/community/discussions/25722#discussioncomment-3248917
+        types: [opened, synchronize, reopened, ready_for_review]
+    # Allows us to run the workflow manually from the Actions tab
+    workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  generate-doc-options:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - run: nix build .#docs
+
+      - run: nix run .#hugo
+
+      - name: Store hugo
+        uses: ./.github/actions/upload-artifact
+        with:
+          name: hugo
+          path: ./hugo/public
+
+  deploy-docs:
+    needs: generate-doc-options
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Get nix build output
+        uses: ./.github/actions/download-artifact
+        with:
+          name: hugo
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v3
+
+      - name: Upload GH pages artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          path: './hugo/public'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2