fix(image): take scheme-less health-check URLs, anchor the compose pin, say which tools left

src/__tests__/runtime-package-pins.test.ts

@@ -92,7 +92,12 @@ describe("runtime package pins", () => {
       pg!.image,
     );
     expect(client, `a pinned major 18 image, not ${pg!.image}`).not.toBeNull();
-    const db = /^\s*image:\s*postgres:(\d+\.\d+)-alpine$/m.exec(COMPOSE);
+    // The `db` service's own image line, not the first postgres image in the
+    // file: `db-upgrade` carries the previous major.
+    const db =
+      /^ {2}db:\n(?:(?! {2}\S).*\n)*? {4}image:\s*postgres:(\d+\.\d+)-alpine$/m.exec(
+        COMPOSE,
+      );
     expect(db, "the compose file pins the database").not.toBeNull();
     // One decision: a database minor bump moves the client with it.
     expect(client![1]).toBe(db![1]);

src/__tests__/wget-shim.test.ts

@@ -175,6 +175,12 @@ describe("wget shim", () => {
     expect((await wget(["--spider"])).code).toBe(2);
   });
 
+  it("takes a URL without a scheme, like busybox wget", async () => {
+    const bare = base.replace(/^http:\/\//, "");
+    expect((await wget(["-qO-", `${bare}/ok`])).code).toBe(0);
+    expect((await wget(["-qO-", `${bare}/down`])).code).toBe(1);
+  });
+
   it("is what the image installs as wget", () => {
     const dockerfile = readSource("Dockerfile", "AS runner");
     const runner = dockerfile.slice(dockerfile.search(/^FROM .* AS runner$/m));