workflows: Move i386 clang check-memory run to amd64

In recent Debian testing, valgrind now shows a gazillion
Memcheck:{Cond,Value4} errors all over the place: in GMP, GnuTLS, glib
hashtables, and even strcmp().

Give up at last, and run valgrind on 64 bit only. This also becomes less
important with us moving more and more code away from C.

.github/workflows/unit-tests-refresh.yml

@@ -32,14 +32,14 @@ jobs:
         timeout-minutes: 20
         run: containers/unit-tests/start --verbose --env=CC=gcc --image-tag=latest --make check-memory
 
-      - name: Run i386 clang check-memory test
+      - name: Run amd64 clang check-memory test
         timeout-minutes: 20
         # HACK: https://bugs.kde.org/show_bug.cgi?id=452758
-        run: containers/unit-tests/start --verbose --env=CC=clang --env=CFLAGS='-O2 -gdwarf-4' --image-tag=i386 --make check-memory
+        run: containers/unit-tests/start --verbose --env=CC=clang --env=CFLAGS='-O2 -gdwarf-4' --image-tag=latest --make check-memory
 
-      - name: Run amd64 clang distcheck test
+      - name: Run i386 clang distcheck test
         timeout-minutes: 15
-        run: containers/unit-tests/start --verbose --env=CC=clang --image-tag=latest --make distcheck
+        run: containers/unit-tests/start --verbose --env=CC=clang --image-tag=i386 --make distcheck
 
       - name: Run i386 gcc distcheck test
         timeout-minutes: 15

.github/workflows/unit-tests.yml

@@ -7,9 +7,9 @@ jobs:
     strategy:
       matrix:
         startarg:
-          - { make: 'check-memory', cc: 'clang', tag: 'i386' }
+          - { make: 'check-memory', cc: 'clang', tag: 'latest' }
           - { make: 'check-memory', cc: 'gcc', tag: 'latest' }
-          - { make: 'distcheck', cc: 'clang', tag: 'latest' }
+          - { make: 'distcheck', cc: 'clang', tag: 'i386' }
           - { make: 'distcheck', cc: 'gcc', tag: 'i386' }
           - { make: 'pytest-cov', cc: 'gcc', tag: 'latest' }
           - { make: 'check', cc: 'gcc', tag: 'latest' }