Add go build caching to accelerate builds

[DubbaThony]

Description

Changes proposed in this pull request:

• Remove -a parameter from go build in Dockerfile: this will allow golang to use build caching
• Add mount type cache to go build command in Dockerfile

This will allow to drastically cut down the building time for subsequent builds. On my local machine this changed build time from 1m 7s to 8s

Related issue(s)

None

[CLAassistant]

All committers have signed the CLA.

[kyma-bot]

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