fix(docker): handle redundant port in image (#11852)

lib/util/url.spec.ts

@@ -81,7 +81,7 @@ describe('util/url', () => {
 
   it('ensures path prefix', () => {
     expect(ensurePathPrefix('https://index.docker.io', '/v2')).toBe(
-      'https://index.docker.io/v2'
+      'https://index.docker.io/v2/'
     );
     expect(ensurePathPrefix('https://index.docker.io/v2', '/v2')).toBe(
       'https://index.docker.io/v2'
@@ -89,6 +89,12 @@ describe('util/url', () => {
     expect(
       ensurePathPrefix('https://index.docker.io/v2/something', '/v2')
     ).toBe('https://index.docker.io/v2/something');
+    expect(ensurePathPrefix('https://index.docker.io:443', '/v2')).toBe(
+      'https://index.docker.io/v2/'
+    );
+    expect(
+      ensurePathPrefix('https://index.docker.io/something?with=query', '/v2')
+    ).toBe('https://index.docker.io/v2/something?with=query');
   });
 
   it('joinUrlParts', () => {

lib/util/url.ts

@@ -6,7 +6,7 @@ export function joinUrlParts(...parts: string[]): string {
 
 export function ensurePathPrefix(url: string, prefix: string): string {
   const parsed = new URL(url);
-  const fullPath = url.replace(parsed.origin, '');
+  const fullPath = parsed.pathname + parsed.search;
   if (fullPath.startsWith(prefix)) {
     return url;
   }