Providing an ENTRYPOINT in Dockerfiles is best practice, so I've added
an ENTRYPOINT to Dockerfile and Dockerfile.debian, setting it to erigon,
because it's the binary most people want to run. The setting can be
overridden in the ` docker run` command to execute different binaries.
Currently everybody has to override it anyway, because there's neither a
CMD nor an ENTRYPOINT given.
The Dockerfile.release already contains the ENTRYPOINT erigon.
P.S.: This PR originated in #6862.
That's an initial PR mostly for code review, not ready for production
use
Got basic GraphQL working when querying a single block
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Co-authored-by: Alex Sharov <AskAlexSharov@gmail.com>