Automatic lambda layer and docker image creation

[vincentsarago]

With #24 and #21 I think it's clear that we should have a way to create/update the docker image and also to have the lambda layer deploy

As mentioned in #26 we should only focus on the latest GDAL version (3.0.1, 2.4.2 and master). For Python version it's a little bit difficult but I think supporting 3.6 and 3.7 should be enought ?

so at the end the process should create

• gdal2.4.2-py3.7 (layer + docker image)
• gdal2.4.2-py3.6 (layer + docker image)
• gdal3.0.1-py3.7 (layer + docker image)
• gdal3.0.1-py3.6 (layer + docker image)
• gdalmaster-py3.7 (layer + docker image)
• gdalmaster-py3.6 (layer + docker image)

To achieve this I think we should also refator the whole repo architecture

gdal2/
    /python36
    /python37
gdal3/
    /python36
    /python37
gdalmaster
    /python36
    /python37

every commit to master should trigger build/deploy