Rename docker file to get syntax highlighting

[larsroettig]

Description

Is your feature request related to a problem? Please describe.*
Using Dockerfile.dev or Dockerfile.prod you'll lose syntax highlighting as Dockerfile should be the extention.

Describe the solution you'd like
Changing to dev.dockerfile and prod.dockerfile etc. will be much more convenient.

Related Issue

Closes #2198

Acceptance

Verification Stakeholders

Specification

Verification Steps

1. CI builds should pass.
2. bash docker/run-docker should be successful.

Screenshots / Screen Captures (if appropriate)

Checklist

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

[PWAStudioBot]

	Fails
🚫	Issue 2198 is closed. Please make sure the linked issue is correct and open.
🚫	A version label is required. A maintainer must add one.

	Messages
📖	Access a deployed version of this PR here. Make sure to wait for the "pwa-pull-request-deploy" job to complete.
📖	DangerCI Failures related to missing labels/description/linked issues/etc will persist until the next push or next nightly build run (assuming they are fixed).

Generated by 🚫 dangerJS against abb057a

[dpatil-magento]

Verification steps pass, waiting for related PR in CI repo to get approved.