Add badge for the Coverity build

The current badge reflects the status of the Coverity report
and it is green even if the Coverity build fails.
The Coverity build fails and nobody knows about it,
becase there is no badge that reflects it.
So let's add a badge for the Coverity build.

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

.github/workflows/coverity.yml

@@ -1,5 +1,5 @@
 # Coverity check
-name: Coverity
+name: CoverityBuild
 
 on:
   workflow_dispatch:

README.md

@@ -8,7 +8,8 @@
 [![GPU](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/gpu.yml/badge.svg?branch=main)](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/gpu.yml)
 [![Nightly](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/nightly.yml/badge.svg?branch=main)](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/nightly.yml)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/oneapi-src/unified-memory-framework/badge)](https://securityscorecards.dev/viewer/?uri=github.com/oneapi-src/unified-memory-framework)
-[![Coverity](https://scan.coverity.com/projects/29761/badge.svg?flat=0)](https://scan.coverity.com/projects/oneapi-src-unified-memory-framework)
+[![Coverity build](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/coverity.yml/badge.svg?branch=main)](https://github.com/oneapi-src/unified-memory-framework/actions/workflows/coverity.yml)
+[![Coverity report](https://scan.coverity.com/projects/29761/badge.svg?flat=0)](https://scan.coverity.com/projects/oneapi-src-unified-memory-framework)
 
 ## Introduction