PROJ/.github/workflows/docker.yml, branch 8.1.0

PROJ/.github/workflows/docker.yml, branch 8.1.0 Forked from https://github.com/OSGeo/PROJ GitHub Action to build both the 'proj' and 'proj-docs' container (#2618) 2021-03-28T20:03:58+00:00 Howard Butler howard@hobu.co 2021-03-28T20:03:58+00:00 79c90906be6c7a1d827bfc89e8888f40509fae10 * adapt PDAL's docker build script for PROJ * try building doc builder container too * don't push containers on pull_request

* adapt PDAL's docker build script for PROJ

* try building doc builder container too

* don't push containers on pull_request