modify docker image nightly to v2.6.0 (#375)

Author: Nicole00

client/src/test/resources/docker-compose.yaml

@@ -1,7 +1,7 @@
 version: '3.4'
 services:
   metad0:
-    image: vesoft/nebula-metad:nightly
+    image: vesoft/nebula-metad:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -38,7 +38,7 @@ services:
       - SYS_PTRACE
 
   metad1:
-    image: vesoft/nebula-metad:nightly
+    image: vesoft/nebula-metad:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -75,7 +75,7 @@ services:
       - SYS_PTRACE
 
   metad2:
-    image: vesoft/nebula-metad:nightly
+    image: vesoft/nebula-metad:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -112,7 +112,7 @@ services:
       - SYS_PTRACE
 
   storaged0:
-    image: vesoft/nebula-storaged:nightly
+    image: vesoft/nebula-storaged:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -153,7 +153,7 @@ services:
       - SYS_PTRACE
 
   storaged1:
-    image: vesoft/nebula-storaged:nightly
+    image: vesoft/nebula-storaged:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -194,7 +194,7 @@ services:
       - SYS_PTRACE
 
   storaged2:
-    image: vesoft/nebula-storaged:nightly
+    image: vesoft/nebula-storaged:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -235,7 +235,7 @@ services:
       - SYS_PTRACE
 
   graphd0:
-    image: vesoft/nebula-graphd:nightly
+    image: vesoft/nebula-graphd:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -273,7 +273,7 @@ services:
       - SYS_PTRACE
 
   graphd1:
-    image: vesoft/nebula-graphd:nightly
+    image: vesoft/nebula-graphd:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"
@@ -311,7 +311,7 @@ services:
       - SYS_PTRACE
 
   graphd2:
-    image: vesoft/nebula-graphd:nightly
+    image: vesoft/nebula-graphd:v2.6.0
     environment:
       USER: root
       TZ:   "${TZ}"