Added healthchecks to matrix postgres containers

stacks/matrix.yml

@@ -60,6 +60,13 @@ services:
         constraints:
           - 'node.labels.class==matrix'
 
+    healthcheck:
+      test: pg_isready
+      interval: 30s 
+      timeout: 5s
+      retries: 3
+      start_period: 15s
+    
     environment:
       - 'POSTGRES_DB=matrix_fb'
       - 'POSTGRES_USER=matrix_fb'
@@ -109,6 +116,13 @@ services:
         constraints:
           - 'node.labels.class==matrix'
 
+    healthcheck:
+      test: pg_isready
+      interval: 30s 
+      timeout: 5s
+      retries: 3
+      start_period: 15s
+
     environment:
       - 'POSTGRES_DB=matrix_signal'
       - 'POSTGRES_USER=matrix_signal'