pdf: fix feature

Signed-off-by: Rodrigo Bertoldo de Sousa Martins <rodrigo.sousa.577@gmail.com>

Dockerfile

@@ -8,6 +8,7 @@ ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium-browser
 RUN apt-get update && apt-get install -y chromium \
     libgconf-2-4 \
     postgresql-client \
+    graphicsmagick \
     && rm -rf /var/lib/apt/lists/* \
     && ln -sf /usr/bin/chromium /usr/bin/chromium-browser