Make the `issuer` optional on upstream OAuth 2.0 providers #1157

Job	Run time
Check schema	4m 44s
Check schema	4m 44s
Run `cargo deny` checks	27s
Run `cargo deny` checks	27s
Compile test artifacts	3m 38s
Compile test artifacts	3m 38s
Check frontend style	51s
Check frontend style	51s
Run the frontend test suite	51s
Run the frontend test suite	51s
Check Rust style	14s
Check Rust style	14s
Lint and test OPA policies	3s
Lint and test OPA policies	3s
Check syn2mas	15s
Check syn2mas	15s
Run Clippy	2m 22s
Run Clippy	2m 22s
Run test suite with Rust stable (1)	2m 35s
Run test suite with Rust stable (1)	2m 4s
Run test suite with Rust stable (2)	2m 30s
Run test suite with Rust stable (2)	2m 30s
Tests done	2s
Tests done	4s
	36m 35s

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