Add GitHub Action to publish content.

.github/actions/create-ssh-key/action.yml

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+name: 'Create SSH key'
+description: 'Setups SSH key for future use.'
+
+inputs:
+  private-key:
+    description: 'Private key contents (id_rsa)'
+    required: true
+
+  host-label:
+    description: 'SSH name'
+    default: 'server'
+
+  host:
+    description: 'Default connection host'
+    required: true
+
+  port:
+    description: 'SSH port'
+    default: '22'
+
+  user:
+    description: 'Default connection user'
+    required: true
+
+  strict-host-key-checking:
+    description: 'Is host key should be strict checked'
+    # Disabled by default for straight forward connection.
+    default: 'no'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Create SSH key
+      shell: bash
+      run: |
+        mkdir -p ~/.ssh;
+        echo "${{ inputs.private-key }}" > ~/.ssh/id_rsa
+        chmod 600 ~/.ssh/id_rsa
+        cat >>~/.ssh/config <<END
+        Host ${{ inputs.host-label }}
+          HostName ${{ inputs.host }}
+          Port ${{ inputs.port }}
+          User ${{ inputs.user }}
+          IdentityFile ~/.ssh/id_rsa
+          StrictHostKeyChecking ${{ inputs.strict-host-key-checking }}
+        END

.github/workflows/cd.yml

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+name: CD
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  publish:
+    if: startsWith(github.ref, 'refs/tags/') || github.event_name == 'workflow_dispatch'
+    name: Publish
+    runs-on: ubuntu-latest
+    environment:
+      name: production
+      url: https://niklan.net
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Create SSH key
+        uses: ./.github/actions/create-ssh-key
+        with:
+          private-key: ${{ secrets.cd_production_deploy_key }}
+          user: ${{ secrets.cd_production_user }}
+          host: ${{ secrets.cd_production_host }}
+          port: ${{ secrets.cd_production_port }}
+
+      - name: Sync content
+        shell: bash
+        run: |
+          ssh server <<< "
+            cd ${{ secrets.cd_production_content_directiory }}
+            mkdir -p ${{ secrets.cd_production_deploy_files }}
+            drush sql:dump \
+              --gzip \
+              --structure-tables-list=cache,cache_*,flood,history,queue,search_index,search_api_*,semaphore,sequences,sessions,watchdog \
+              > ${{ secrets.cd_production_deploy_directory }}/pre-deploy.sql.gz
+            git fetch
+            git checkout
+            git pull
+            drush niklan:sync:blog
+          "