Enable release of Siembol chart to G-Research/charts repo

[ljubon]

What type of PR is this?

Improve release process, CI/CD

What this PR does / why we need it:

This change will enable the Siembol team to release new charts to G-Research/charts
Following the picture below:

• App code is Siembol
• GitHub App is pre-defined G-Research bot with required permissions for this acction
• G-Reserach/charts is repo indicating the gh-pages branch where the chart will be published

Which issue(s) this PR fixes:

Packaging and publishing Siembol chart in a unified way described above to G-Research/chart repo and artifacthub.io as artifact management

Special notes for your reviewer:

Please make sure you have the following:

• Secrets created
  • APP_ID and GH_APP_PEM
• GitHub App installed on siembol repo (with appropriate access) - get in touch with @jgiannuzzi to verify
• IMPORTANT This PR will create a release whenever there is a tag pushed starting with v* - please make sure the team is aligned and familiar with this decision or suggest an alternative solution

[github-actions]

Unit Test Results

1 159 tests  ±0   1 154 ✔️ ±0   1m 35s ⏱️ -1s
   123 suites ±0          5 💤 ±0 
   123 files   ±0          0 ❌ ±0 

Results for commit 0d2c4fe. ± Comparison against base commit 1bd2fb6.