test: pin the external fixtures and run the suites against the silo binary

The test and verification scripts invoked ./minio and pulled their tooling from
upstream infrastructure with no integrity check. Every `curl | tar` of a client
or an old server binary was an unverified execution path in a script that
regularly runs as a privileged user, and several fetched a floating "latest".

Two installers replace all of it:

- install-mcli.sh resolves a pinned pgsty/mc release, downloads the archive and
  its checksum manifest, requires exactly one valid manifest entry for the
  asset, verifies it, and installs. MCLI_BIN with a mandatory MCLI_SHA256 lets
  an offline or air-gapped run supply its own binary, still checksum-checked.
- install-verified-fixture.sh takes source, expected SHA-256 and target, and
  refuses anything that does not match. Sources may be a URL or a local file.

Every script that previously downloaded mc now calls install-mcli.sh. The three
places that genuinely need an upstream artifact - the old MinIO server binary
for the LDAP IAM upgrade-import test, the 2021 mc for the three-site
replication test, and the functional-tests.sh fixture - go through
install-verified-fixture.sh with the digest recorded inline. Those dl.min.io
URLs remain on purpose: they are historical upstream artifacts needed to prove
upgrade compatibility, and they are now pinned and verified rather than
trusted.

The scripts otherwise switch to ./silo, silo.service, the silo container and
compose service names, and SILO_CONFIG_DIR. run-multi-site-minio-idp.sh is
renamed to run-multi-site-silo-idp.sh with the Makefile target following.
buildscripts/minio-upgrade.sh keeps its name and its `minio server` argv - it
exists to test the MinIO-to-Silo upgrade, so the old side must stay old - but
it is now pinned to an image digest rather than a tag, and its `docker system
prune` and `docker volume prune` calls are removed. Those ran unfiltered
against the developer's whole Docker installation; the resiliency tests had the
same problem and lose their prune and `docker ps -q` sweeps too.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/bucket/replication/sio-error.sh

@@ -9,7 +9,7 @@ export CI=1
 
 make || exit 255
 
-killall -9 minio || true
+killall -9 silo || true
 
 rm -rf /tmp/xl/
 mkdir -p /tmp/xl/1/ /tmp/xl/2/
@@ -26,39 +26,39 @@ for i in $(seq 1 $NODES); do
 done
 
 for i in $(seq 1 $NODES); do
-	./minio server --address "127.0.0.1:$((9000 + i))" ${args1[@]} & # | tee /tmp/minio/node.$i &
-	./minio server --address "127.0.0.1:$((9100 + i))" ${args2[@]} & # | tee /tmp/minio/node.$i &
+	./silo server --address "127.0.0.1:$((9000 + i))" ${args1[@]} & # | tee /tmp/minio/node.$i &
+	./silo server --address "127.0.0.1:$((9100 + i))" ${args2[@]} & # | tee /tmp/minio/node.$i &
 done
 
 sleep 10
 
-./mc alias set myminio1 http://localhost:9001 minioadmin minioadmin
-./mc alias set myminio2 http://localhost:9101 minioadmin minioadmin
+./mc alias set mysilo1 http://localhost:9001 minioadmin minioadmin
+./mc alias set mysilo2 http://localhost:9101 minioadmin minioadmin
 
-./mc ready myminio1
-./mc ready myminio2
+./mc ready mysilo1
+./mc ready mysilo2
 sleep 1
 
-./mc mb myminio1/testbucket/ --with-lock
-./mc mb myminio2/testbucket/ --with-lock
+./mc mb mysilo1/testbucket/ --with-lock
+./mc mb mysilo2/testbucket/ --with-lock
 
-./mc encrypt set sse-s3 my-minio-key myminio1/testbucket/
-./mc encrypt set sse-s3 my-minio-key myminio2/testbucket/
+./mc encrypt set sse-s3 my-minio-key mysilo1/testbucket/
+./mc encrypt set sse-s3 my-minio-key mysilo2/testbucket/
 
-./mc replicate add myminio1/testbucket --remote-bucket http://minioadmin:minioadmin@localhost:9101/testbucket --priority 1
-./mc replicate add myminio2/testbucket --remote-bucket http://minioadmin:minioadmin@localhost:9001/testbucket --priority 1
+./mc replicate add mysilo1/testbucket --remote-bucket http://minioadmin:minioadmin@localhost:9101/testbucket --priority 1
+./mc replicate add mysilo2/testbucket --remote-bucket http://minioadmin:minioadmin@localhost:9001/testbucket --priority 1
 
 sleep 1
 
 cp README.md internal.tar
 
-./mc cp internal.tar myminio1/testbucket/dir/1.tar
-./mc cp internal.tar myminio2/testbucket/dir/2.tar
+./mc cp internal.tar mysilo1/testbucket/dir/1.tar
+./mc cp internal.tar mysilo2/testbucket/dir/2.tar
 
 sleep 1
 
-./mc ls -r --versions myminio1/testbucket/dir/ >/tmp/dir_1.txt
-./mc ls -r --versions myminio2/testbucket/dir/ >/tmp/dir_2.txt
+./mc ls -r --versions mysilo1/testbucket/dir/ >/tmp/dir_1.txt
+./mc ls -r --versions mysilo2/testbucket/dir/ >/tmp/dir_2.txt
 
 out=$(diff -qpruN /tmp/dir_1.txt /tmp/dir_2.txt)
 ret=$?