ci: fix isRelease condition (#1066)

ci/azure-is-release.yml

@@ -2,7 +2,7 @@ steps:
   - bash: |
       set -e
 
-      if git log --no-merges -1 --format='%s' | grep -q '[ci-release]'; then
+      if git log --no-merges -1 --format='%B' | grep -qF '[ci-release]'; then
         echo "##vso[task.setvariable variable=isRelease]true"
       fi
     failOnStderr: true

ci/azure-test-stable.yml

@@ -28,7 +28,7 @@ jobs:
         CI: 'True'
       displayName: cargo test -p ${{ crate }}
       workingDirectory: $(Build.SourcesDirectory)/${{ crate }}
-      condition: and(succeeded(), not(variables['isRelease']))
+      condition: and(succeeded(), ne(variables['isRelease'], 'true'))
 
   - template: azure-patch-crates.yml