Improve job names for miri jobs

Author: dtolnay

.github/workflows/ci.yml

@@ -80,16 +80,20 @@ jobs:
       - run: cargo check --locked
 
   miri:
-    name: Miri
+    name: Miri (${{matrix.name}})
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        target:
-          - x86_64-unknown-linux-gnu
-          - powerpc64-unknown-linux-gnu
-          - i686-unknown-linux-gnu
-          - mips-unknown-linux-gnu
+        include:
+          - name: 64-bit little endian
+            target: x86_64-unknown-linux-gnu
+          - name: 64-bit big endian
+            target: powerpc64-unknown-linux-gnu
+          - name: 32-bit little endian
+            target: i686-unknown-linux-gnu
+          - name: 32-bit big endian
+            target: mips-unknown-linux-gnu
     env:
       MIRIFLAGS: -Zmiri-strict-provenance
     timeout-minutes: 45