CI: Speed up builds

[jackw]

What this PR does / why we need it:
CI builds are slow due to multiple yarn installs happening. This PR addresses this by using the cache action to store the node_modules and generated/node_modules | yarn.lock files to speed up ci.

Before	After

Also spruces up the readme a bit with badges and grafana logo. 😃

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[tolzhabayev]

https://stackoverflow.com/a/62244232

Solution 1 says:
you don't need actions/cache@v3 anymore and since you arleady use setup-node with cache: yarn you can just yarn --prefer-offline instead.

So basically:
remove https://github.com/grafana/plugin-tools/pull/152/files#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR21-R30

and change this line https://github.com/grafana/plugin-tools/pull/152/files#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR33

to

yarn install --immutable --prefer-offline

[jackw]

Nice! Thanks for the feedback @tolzhabayev I've updated the PR with the suggested changes.

stale

[tolzhabayev]

This part can also go I think?

plugin-tools/.github/workflows/ci.yml

Lines 21 to 27 in 934365e

	- name: Cache node modules
	uses: actions/cache@v3
	with:
	path: packages/create-plugin/generated/yarn.lock
	key: yarn-generated-lock-${{ hashFiles('yarn.lock') }}
	restore-keys: |
	yarn-generated-lock-${{ hashFiles('yarn.lock') }}

[jackw]

This part can also go I think?

plugin-tools/.github/workflows/ci.yml

Lines 21 to 27 in 934365e

	- name: Cache node modules
	uses: actions/cache@v3
	with:
	path: packages/create-plugin/generated/yarn.lock
	key: yarn-generated-lock-${{ hashFiles('yarn.lock') }}
	restore-keys: |
	yarn-generated-lock-${{ hashFiles('yarn.lock') }}

Turns out you're right. Have removed it. 👍

[tolzhabayev]

Send 🇮🇹

[grafanabot]

🚀 PR was released in @grafana/create-plugin@0.6.2 🚀