try to use 3rd party action instead

Author: biozal

.github/workflows/kind-maven.yaml

@@ -55,8 +55,11 @@ jobs:
           echo $envIpPort
           echo "connectionString = ${envIpAddress}:${envIpPort}?network=external" >> $GITHUB_ENV 
       - name: fix connection string
-        run: |
-          sed -i "s|127.0.0.1|$connectionString|" src/main/java/org/couchbase/quickstart/configs/ConfigDb.java
+        uses: jacobtomlinson/gha-find-replace@master 
+        with:
+          find: "127.0.0.1"
+          replace: $connectionString
+          include: "src/main/java/org/couchbase/quickstart/configs/ConfigDb.java" 
       - name: validate file fix
         run: cat src/main/java/org/couchbase/quickstart/configs/ConfigDb.java 
       - name: Build with Maven