fix strategy

Author: FZambia

.github/workflows/ci.yaml

@@ -9,8 +9,35 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        sdk: [3.6, stable, beta] # note, not testing on 3.3 due to build_runner CI dependency problem.
-        protobuf: ["3.1.0", "4.0.0", "5.0.0"] # make sure works with both protobuf versions.
+        # Test compatible SDK and protobuf version combinations
+        # protobuf 3.1.0: SDK >= 2.19
+        # protobuf 4.0.0: SDK >= 3.3
+        # protobuf 4.1.0: SDK >= 3.6
+        # protobuf 4.2.0+: SDK >= 3.7
+        # protobuf 5.0.0+: SDK >= 3.7
+        include:
+          # Test older protobuf versions with SDK 3.4
+          - sdk: "3.4"
+            protobuf: "3.1.0"
+          - sdk: "3.4"
+            protobuf: "4.0.0"
+          # Test latest protobuf versions with SDK 3.7+ (stable and beta)
+          - sdk: stable
+            protobuf: "3.1.0"
+          - sdk: stable
+            protobuf: "4.0.0"
+          - sdk: stable
+            protobuf: "4.2.0"
+          - sdk: stable
+            protobuf: "5.0.0"
+          - sdk: beta
+            protobuf: "3.1.0"
+          - sdk: beta
+            protobuf: "4.0.0"
+          - sdk: beta
+            protobuf: "4.2.0"
+          - sdk: beta
+            protobuf: "5.0.0"
     steps:
       - uses: actions/checkout@v4
 

pubspec.yaml

@@ -8,7 +8,7 @@ description: >
 homepage: https://github.com/centrifugal/centrifuge-dart
 
 environment:
-  sdk: '>=3.6.0 <4.0.0'
+  sdk: '>=3.3.0 <4.0.0'
 
 dependencies:
   fixnum: ^1.0.0