chore: fix dockerfile FROM statement

[insumity]

Problem
Trying to run the e2e tests locally would give:

OCI runtime exec failed: exec failed: unable to start container process: exec /usr/local/bin/hermes: no such file or directory: unknown
exit status 1
make: *** [test-e2e-short] Error 1

Solution
Fixed by adding --platform=linux/amd64 in the relevant FROM statement.
Also, added the Dockerfile in the test GitHub actions because a change there might lead to the tests failing.

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[p-offtermatt]

Let's also add the same FROM in Dockerfile.gaia, right?

[p-offtermatt]

LGTM, a nit. I also added a modification in Dockerfile.gaia, please check it out and revert if you think it's not correct

[p-offtermatt]

Maybe do Dockerfile
and Dockerfile.*
e.g. if we get a Dockerfile.test at some point, it's covered.
(or even just Dockerfile*, instead)

[bermuell]

LGTM, pls address comments from @p-offtermatt