Fix Dockerfile and docker run command for binary build

[Mkhgkk]

Error:

- LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 8)
docker run --rm -v :/out \
temp sh -c "rm -rf /out/binaries && cp -r /s/binaries /out/"
docker: invalid spec: :/out: empty section between colons.
See 'docker run --help'.
make: *** [scripts/binaries.mk:65: binaries] Error 125

This pull request addresses the two issues in the binaries.mk file that prevent the proper building of binaries using Docker:

1. Legacy ENV format: The Dockerfile was using the legacy ENV key value format, which results in a warning. The newer ENV key=value format is recommended. This PR updates the line to follow the new format: Changed ENV CGO_ENABLED 0 to ENV CGO_ENABLED=0.

2. Empty section in volume mount path: The docker run command was using an invalid volume mount syntax, leading to an "empty section between colons" error. The $(PWD) macro was replaced with $(shell pwd) to correctly reference the current working directory.

Testing: After making these changes, I was able to successfully build the binaries using the provided instructions without encountering the errors mentioned.