feat: rename bulk environment variables #92

Job	Run time
build-and-test / build_and_publish	1m 31s
Determine image tag	3s
Build OCI images (post-compute) / build	7m 18s
Build OCI images (pre-compute) / build	6m 45s
Build TEE images (registry.scontain.com/scone-debug/iexec-sconify-image-unlocked, 5.9.1, /app/tee...	1m 4s
Build TEE images (registry.scontain.com/scone-debug/iexec-sconify-image-unlocked, 5.9.1, /app/tee...	1m 5s
	17m 46s

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