fix migration 5 -> 6 not run

[jlg4]

What does this implement/fix? Explain your changes.

• fixes if DatabaseVersion == 4, migration 5 -> 6 will not run resulting in invalid schema.
• adds build.yml github action which builds and runs test on PR's and push'es to master branch.

Does this close any currently open issues?
no, addresses #81

Mention issue using basic-writing-and-formatting-syntax#referencing-issues-and-pull-requests

Any relevant logs, error output, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

Where has this been tested?

unit test

.Net Core Version: …
net5
Does this introduce a breaking change?

• Yes
• [ x] No

Any other comments?

…

[gottscj]

as shown here: we are missing migration 5.
I did it manually, but it screwed our deployment to prod, as our staging environment did get migration 5.

[vova3211]

Hi @jlg4 !
You are right, that because after first migration lastHistory.DatabaseVersion should be increased. Then next migration will be applied also.

Your functionality looks fine, but need more time to review it more precisely.

I'll add hotfix to increase lastHistory.DatabaseVersion after each migration for now. So it won't broke anyone db, and will back to review asap.

[vova3211]

And of course, thanks for your contribution ;)

[vova3211]

@jlg4 new nuget package ready 8.3.3

BUT it won't fix your db automatically.
To get all working delete last migration record with DatabaseVersion = 6. Then deploy you app with new lib version.