fix the nnbd plugin test exclusion logic

.cirrus.yml

@@ -39,8 +39,16 @@ task:
         - flutter channel $CHANNEL
         - ./script/incremental_build.sh test
     - name: analyze
+      env:
+        matrix:
+          CHANNEL: "master"
+          CHANNEL: "stable"
       script: ./script/incremental_build.sh analyze
     - name: build_all_plugins_apk
+      env:
+        matrix:
+          CHANNEL: "master"
+          CHANNEL: "stable"
       script:
         # TODO(jackson): Allow web plugins once supported on stable
         # https://github.com/flutter/flutter/issues/42864
@@ -143,6 +151,10 @@ task:
     - xcrun simctl create Flutter-iPhone com.apple.CoreSimulator.SimDeviceType.iPhone-X com.apple.CoreSimulator.SimRuntime.iOS-13-3 | xargs xcrun simctl boot
   matrix:
     - name: build_all_plugins_ipa
+      env:
+        matrix:
+          CHANNEL: "master"
+          CHANNEL: "stable"
       script:
         # TODO(jackson): Allow web plugins once supported on stable
         # https://github.com/flutter/flutter/issues/42864
@@ -196,6 +208,10 @@ task:
   activate_script: pub global activate flutter_plugin_tools
   matrix:
     - name: build_all_plugins_app
+      env:
+        matrix:
+          CHANNEL: "master"
+          CHANNEL: "stable"
       script:
         - flutter channel master
         - ./script/build_all_plugins_app.sh macos

script/build_all_plugins_app.sh

@@ -46,7 +46,7 @@ readonly EXCLUDED=$(IFS=, ; echo "${EXCLUDED_PLUGINS_LIST[*]}")
 
 ALL_EXCLUDED=($EXCLUDED)
 # Exclude nnbd plugins from stable.
-if [[ "$CHANNEL" -eq "stable" ]]; then
+if [ "$CHANNEL" == "stable" ]; then
   ALL_EXCLUDED=("$EXCLUDED,$EXCLUDED_PLUGINS_FROM_STABLE")
 fi
 

script/incremental_build.sh

@@ -16,7 +16,7 @@ fi
 # Plugins that are excluded from this task.
 ALL_EXCLUDED=("")
 # Exclude nnbd plugins from stable.
-if [[ "$CHANNEL" -eq "stable" ]]; then
+if [ "$CHANNEL" == "stable" ]; then
   ALL_EXCLUDED=($EXCLUDED_PLUGINS_FROM_STABLE)
   echo "Excluding the following plugins: $ALL_EXCLUDED"
 fi