add migrations bundle container

[DmyMi]

To be able to easily apply migrations to test and prod environment without headache with creating custom tooling and/or SQL scripts.

• Both AuthorizationServer and Migrations are publishable projects and ef migration bundle command does publish - this lead to file naming conflicts and some other errors. So current solution was to move OpenIdDictDbContext to AuthCommon project and remove AuthorizationServer reference in Migrations project. It also saved like 2-3 MB of final image size.
• As bundle creates DB context with default connection string and replaces it only right before applying the migration, had to revert to simple connection string placeholder without any checks.
• Removed unused context&migration that was tied to AuthorizationServer. Will remove it's components from codebase later.
• Environment variables placeholders for connection string can be replaced at runtime
• Add local EF Core CLI config to be installed for container build. Can also be used for development if unable to install it globally.

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
4 Security Hotspots
1 Code Smell

0.0% Coverage
0.0% Duplication

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