ci: test starting the Kroki services locally

.github/workflows/Documentation.yml

@@ -18,14 +18,27 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1.10'
-      - name: Install dependencies
+      - name: Launch local Kroki service instance(s)
+        run: |
+          julia --project=. -e '
+            using Pkg
+            Pkg.instantiate()
+
+            using Kroki
+            Kroki.Service.start!()
+            Kroki.Service.info()
+          '
+        env:
+          KROKI_CONTAINER_IMAGE_TAG: 0.18.0
+      - name: Set up documentation dependencies
         run: |
           julia --project=docs -e '
             using Pkg
             Pkg.develop(PackageSpec(path=pwd()))
-            Pkg.instantiate()'
+          '
       - name: Build & Deploy
         run: julia --project=docs docs/make.jl
         env:
           # For authentication with GitHub Actions
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          KROKI_ENDPOINT: http://localhost:8000