Install CI dependencies in Forgejo workflow

.forgejo/workflows/ci.yml

@@ -29,12 +29,26 @@ jobs:
           set -euo pipefail
           git clone --depth 1 git@aksal.cloud:Robot-U/robot-u-site.git robot-u-site
 
+      - name: Install CI tooling and dependencies
+        run: |
+          set -euo pipefail
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          curl -fsSL https://bun.sh/install | bash
+          export PATH="$HOME/.local/bin:$HOME/.bun/bin:$PATH"
+          cd robot-u-site
+          uv venv .venv
+          uv pip install -r requirements.txt
+          cd frontend
+          bun install --frozen-lockfile --ignore-scripts
+
       - name: Check Python
         run: |
+          export PATH="$HOME/.local/bin:$HOME/.bun/bin:$PATH"
           cd robot-u-site
           ./scripts/check_python_quality.sh
 
       - name: Check Frontend
         run: |
+          export PATH="$HOME/.local/bin:$HOME/.bun/bin:$PATH"
           cd robot-u-site
           ./scripts/check_frontend_quality.sh