fix: handle quoted docker compose strings

lib/manager/docker-compose/extract.js

@@ -9,7 +9,7 @@ function extractDependencies(content) {
   const deps = [];
   let lineNumber = 0;
   for (const line of content.split('\n')) {
-    const match = line.match(/^\s*image:\s*([^\s]+)\s*$/);
+    const match = line.match(/^\s*image:\s*'?"?([^\s'"]+)'?"?\s*$/);
     if (match) {
       const currentFrom = match[1];
       const {

lib/manager/docker-compose/update.js

@@ -7,7 +7,7 @@ function setNewValue(currentFileContent, upgrade) {
     logger.debug(`setNewValue: ${upgrade.newFrom}`);
     const lines = currentFileContent.split('\n');
     const lineToChange = lines[upgrade.lineNumber];
-    const imageLine = new RegExp(/^(\s*image:\s*)[^\s]+(\s*)$/);
+    const imageLine = new RegExp(/^(\s*image:\s*'?"?)[^\s'"]+('?"?\s*)$/);
     if (!lineToChange.match(imageLine)) {
       logger.debug('No image line found');
       return null;

test/_fixtures/docker-compose/docker-compose.1.yml

@@ -16,7 +16,7 @@ services:
         condition: on-failure
 
   db:
-    image: postgres:9.4.0
+    image: "postgres:9.4.0"
     volumes:
       - db-data:/var/lib/postgresql/data
     networks:
@@ -41,7 +41,7 @@ services:
         condition: on-failure
 
   result:
-    image: dockersamples/examplevotingapp_result:before
+    image: 'dockersamples/examplevotingapp_result:before'
     ports:
       - 5001:80
     networks: