Switch to GHA and GHCR for image building and hosting #87

Job	Run time
Build the main image for geo and proj (1.70)	4m 56s
Build the main image for geo and proj (1.76)	4m 30s
Build the main image for geo and proj (1.77)	5m 8s
Build dependent images for geo and proj (geo-ci, git clone https://github.com/georust/geo && cd g...	5m 16s
Build dependent images for geo and proj (geo-ci, git clone https://github.com/georust/geo && cd g...	4m 21s
Build dependent images for geo and proj (geo-ci, git clone https://github.com/georust/geo && cd g...	4m 6s
Build dependent images for geo and proj (proj-ci, git clone https://github.com/georust/proj && cd...	5m 57s
Build dependent images for geo and proj (proj-ci, git clone https://github.com/georust/proj && cd...	6m 10s
Build dependent images for geo and proj (proj-ci, git clone https://github.com/georust/proj && cd...	6m 4s
Build dependent images for geo and proj (proj-ci-without-system-proj, git clone https://github.co...	5m 23s
Build dependent images for geo and proj (proj-ci-without-system-proj, git clone https://github.co...	5m 3s
Build dependent images for geo and proj (proj-ci-without-system-proj, git clone https://github.co...	4m 59s
	1h 1m 53s

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