tweak: Use prebuilt frontend image for block producers demo

Author: tizoc

docker-compose.local.producers.yml

@@ -10,10 +10,11 @@ services:
 
   frontend:
     container_name: frontend
-    build:
-      context: .
-      dockerfile: Dockerfile_FE
-      args:
-        BUILD_CONFIGURATION: block_producers
+    image: openmina/frontend:0.5.0-block-producers
+    # build:
+    #   context: .
+    #   dockerfile: Dockerfile_FE
+    #   args:
+    #     BUILD_CONFIGURATION: block_producers
     ports:
       - "8070:80"

docs/producer-demo.md

@@ -93,7 +93,7 @@ This demo showcases the block production capabilities of OpenMina nodes within a
 
 3. **Run the following command to start the demo:**
     ```sh
-    docker compose -f docker-compose.local.producers.yml up --build
+    docker compose -f docker-compose.local.producers.yml up
     ```
 
 4. **Open you browser and visit http://localhost:8070**
@@ -115,7 +115,7 @@ This demo showcases the block production capabilities of OpenMina nodes within a
 
 4. **Run the following command to start the demo:**
     ```sh
-    docker compose -f docker-compose.local.producers.yml up --build
+    docker compose -f docker-compose.local.producers.yml up
     ```
 
 5. **Open you browser and visit http://localhost:8070**
@@ -137,7 +137,7 @@ This demo showcases the block production capabilities of OpenMina nodes within a
 
 4. **Run the following command to start the demo:**
     ```sh
-    docker compose -f docker-compose.local.producers.yml up --build
+    docker compose -f docker-compose.local.producers.yml up
     ```
 
 5. **Open you browser and visit http://localhost:8070**