Fix build status badge in README (#4769)

The GitHub Actions build status badge was referencing an old workflow
named `CI`, which always shows red, and is no longer used.

Fix the build status badge to reference the `Release` workload.

Also slightly reformat the matrix build yaml, as the list has grown a
bit.

Signed-off-by: Andrew Seigner <siggy@buoyant.io>

.github/workflows/kind_integration.yml

@@ -96,7 +96,15 @@ jobs:
   kind_integration_tests:
     strategy:
       matrix:
-        integration_test: [cluster-domain, deep, external-issuer, helm-deep, helm-upgrade, uninstall, upgrade-edge, upgrade-stable]
+        integration_test:
+        - cluster-domain
+        - deep
+        - external-issuer
+        - helm-deep
+        - helm-upgrade
+        - uninstall
+        - upgrade-edge
+        - upgrade-stable
     needs: [docker_build]
     name: Integration tests (${{ matrix.integration_test }})
     runs-on: ubuntu-18.04

.github/workflows/release.yml

@@ -121,7 +121,15 @@ jobs:
   kind_integration_tests:
     strategy:
       matrix:
-        integration_test: [cluster-domain, deep, external-issuer, helm-deep, helm-upgrade, uninstall, upgrade-edge, upgrade-stable]
+        integration_test:
+        - cluster-domain
+        - deep
+        - external-issuer
+        - helm-deep
+        - helm-upgrade
+        - uninstall
+        - upgrade-edge
+        - upgrade-stable
     needs: [docker_build]
     name: Integration tests (${{ matrix.integration_test }})
     runs-on: ubuntu-18.04

README.md

@@ -94,7 +94,7 @@ specific language governing permissions and limitations under the License.
 
 <!-- refs -->
 [github-actions]: https://github.com/linkerd/linkerd2/actions
-[github-actions-badge]: https://github.com/linkerd/linkerd2/workflows/CI/badge.svg
+[github-actions-badge]: https://github.com/linkerd/linkerd2/workflows/Cloud%20integration/badge.svg
 [cncf]: https://www.cncf.io/
 [coc]: https://github.com/linkerd/linkerd/wiki/Linkerd-code-of-conduct
 [getting-started]: https://linkerd.io/2/getting-started/