W3C has rate limiter and resolving of base JSONLD contexts
fails if the test cases are executed too fast without caching
the JSONLD documents resolved at their domain. This commit
initializes document caching loader only once so that it can
be reused when unit tests are creating many different service
instances.

integrate helm in project

See merge request eclipse/xfsc/tsa/signer!11

Perform trademark cleanup

See merge request eclipse/xfsc/tsa/signer!10

Check VC proofs before making VP proof

Closes #11

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!9

Partially resolve "Examples Swagger API needs clarification"

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!8

Return empty key list when the vault transit engine is empty

Closes #9

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!7

Authentication middleware is disabled by default

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!5

Use JWT auth middleware with configuration option

Closes #3

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!4

New endpoints to retrieve keys namespaces and key names in a given namespace

Closes #7 and #6

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!3

Additionally this commit changes the URL paths for the endpoints
that retrieve public keys as DID verification methods.

Support separate Vault transit engines as key namespaces

Closes #4 and #2

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!2

Add Go vulnerability check to CI pipeline

See merge request gaia-x/data-infrastructure-federation-services/tsa/signer!1