[Fix] Added libfreetype6 and libcairo2 (#279)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#279

.gitea/docker/Dockerfile.ci

@@ -22,6 +22,8 @@ RUN apt-get update && \
       libxrender1 \
       libxext6 \
       libfontconfig1 \
+      libfreetype6 \
+      libcairo2 \
       && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js 24 via NodeSource