Based on madnight/docker-alpine-wkhtmltopdf
Alpine has wkhtmltopdf package but with unpatched qt, therefor not all wkhtmltopdf features can be used. This container builds wkhtmltopdf and patched qt.
# build the base image
make build.base
# build the golang-alpine image
build.golang-alpine
FROM thobe/wkhtmltopdf:golang1.14-alpine_0.12.6
# stuff of your custom docker image
# ...
# ...