wkhtmltopdf with qt (#1805)

* switch to pre-built image on github with qt support

Makefile

@@ -13,6 +13,10 @@ docker-db:
 	# Run the database
 	docker-compose up db
 
+docker-shell-api:
+	# Shell into the dev container.
+	docker-compose run --rm api bash
+
 docker-shell-web:
 	# Shell into the dev container.
 	# docker run -it --env-file app/.env --entrypoint bash wps-api_api:latest

api/Dockerfile

@@ -22,8 +22,12 @@ RUN R -e "install.packages('cffdrs')"
 # Install JDK
 RUN apt-get -y install openjdk-11-jdk
 
-# Install pdf-kit for PDF generation on HFI
-RUN apt-get -y install wkhtmltopdf
+# Install pdf-kit for PDF generation on HFI (with qt support!)
+# As of writing, 0.12.6 (the most recent) is the version currently being installed by 3.8.12-buster,
+# but without qt. We do a manual instllation of 0.12.6 in order to get qt support.
+RUN apt-get update --fix-missing && apt-get -y install xfonts-75dpi xfonts-base
+RUN wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.buster_amd64.deb -P /tmp && \
+    dpkg -i /tmp/wkhtmltox_0.12.6-1.buster_amd64.deb
 
 # Update pip
 RUN python -m pip install --upgrade pip

openshift/wps-api-base/docker/Dockerfile

@@ -19,21 +19,20 @@
 # When building local, you can reference the docker image:
 FROM tiangolo/uvicorn-gunicorn-fastapi:python3.9
 
-# Install old (2.4.*; current debian) version of gdal and R
-RUN apt-get -y update
-RUN apt-get -y install libgdal-dev
-
-# Install R
-RUN apt-get update --fix-missing && apt-get -y install r-base
+# Install pre-requisites
+# - old (2.4.*; current debian) version of gdal
+# - R (for cffdrs)
+# - JDK (for red-app)
+# - xfonts-75dpi xfonts-base (for wkhtmltopdf)
+RUN apt-get update --fix-missing && apt-get -y install libgdal-dev r-base openjdk-11-jdk xfonts-75dpi xfonts-base
 
 # Install cffdrs
 RUN R -e "install.packages('cffdrs')"
 
-# Install JDK
-RUN apt-get -y install openjdk-11-jdk
-
-# Install pdf-kit for PDF generation on HFI
-RUN apt-get -y install wkhtmltopdf
+# Install pdf-kit for PDF generation on HFI (with qt support!)
+# We can't just run apt-get -y install wkhtmltopdf, because we don't get qt support.
+RUN wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.buster_amd64.deb -P /tmp && \
+    dpkg -i /tmp/wkhtmltox_0.12.6-1.buster_amd64.deb
 
 # Update pip  
 RUN python -m pip install --upgrade pip