docker: version matrix added (#606)

docker/README.md

@@ -0,0 +1,27 @@
+# GRASS GIS docker matrix
+
+| Base image   | Docker tag      | GRASS GIS  | PROJ  | GDAL  | PDAL  | Image size |
+|--------------|-----------------|------------|-------|-------|-------|------------|
+| Ubuntu 18.04 | latest-ubuntu   | 7.9.dev    | 4.9.3 | 2.2.3 | 1.8.0 | 1.04 GB    |
+| Ubuntu 19.10 | latest-ubuntu19 | 7.9.dev    | 5.2.0 | 2.4.2 | 1.9.1 |  850 MB    |
+| Debian 10.1  | latest-debian   | 7.9.dev    | 5.2.0 | 2.4.0 | 1.8.0 | 1.14 GB    |
+| Alpine 3.11  | latest-alpine   | 7.9.dev    | 6.2.1 | 3.0.3 | 1.8.0 |  385 MB    |
+|--------------|-----------------|------------|-------|-------|-------|------------|
+| Ubuntu 18.04 | stable-ubuntu   | 7.8 branch | 4.9.3 | 2.2.3 | 1.8.0 | 1.04 GB    |
+| Ubuntu 19.10 | stable-ubuntu19 | 7.8 branch | 5.2.0 | 2.4.2 | 1.9.1 |  850 MB    |
+| Debian 10.1  | stable-debian   | 7.8 branch | 5.2.0 | 2.4.0 | 1.8.0 | 1.14 GB    |
+| Alpine 3.11  | stable-alpine   | 7.8 branch | 6.2.1 | 3.0.3 | 1.8.0 |  385 MB    |
+
+Latest update: 10 May 2020
+
+# Requirements
+
+ * docker or podman
+
+# Installation
+
+To install a docker image, run (replace `<tag>` with the desired Docker tag from the table above):
+
+```
+docker pull mundialis/grass-py3-pdal:<tag>
+```