Improve CI & CD

[PSchmiedmayer]

Improve CI & CD

♻️ Current situation & Problem

The current CI setup is custom-build for the template application and relies on GitHub Action runners hosted by GitHub.

💡 Proposed solution

• This PR moves most of the logic to the shared repository in the Stanford Biodesign Digital Health Organization.
• Adds the ability to run the CI/CD on self-hosted runners.
• Speeds the builds up using a build cache.

Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

Merging #10 (5c23537) into main (850e923) will increase coverage by 9.18%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main       #10      +/-   ##
===========================================
+ Coverage   90.83%   100.00%   +9.18%     
===========================================
  Files          30         4      -26     
  Lines         741        78     -663     
===========================================
- Hits          673        78     -595     
+ Misses         68         0      -68     

Impacted Files	Coverage Δ
...eSharedContext/CodableArray+RawRepresentable.swift
...s/TemplateMockDataStorageProvider/MockUpload.swift
...ionModules/Sources/TemplateContacts/Contacts.swift
...lateOnboardingFlow/AccountSetup/AccountSetup.swift
...MockDataStorageProvider/MockUploadDetailView.swift
...dules/Sources/TemplateOnboardingFlow/Welcome.swift
...emplateOnboardingFlow/String+ModuleLocalized.swift
...ources/TemplateSchedule/Bundle+Questionnaire.swift
.../TemplateOnboardingFlow/HealthKitPermissions.swift
...mplateMockDataStorageProvider/MockUploadList.swift
... and 16 more

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