ci: clear the checkout token in every job that does not push (#5547)

actions/checkout writes its token into .git/config as an http extraheader,
where it stays for the rest of the job. That matters more here than usual:
pull_request jobs run on self-hosted runners and execute the PR's own build.rs,
proc-macros and tests, any of which can read that file. Test and Lint holds
actions: write on top of that, so its token can cancel runs and delete the
Actions caches the whole pipeline now depends on — it was given
persist-credentials: false when that permission was added, and this extends the
same treatment to the other 45 checkouts.

Two are exempt because the token IS the credential the job needs.
helm-package's publish job pushes to rustfs/helm with it; clearing it would
break chart publishing. nix-flake-update is exempt pending verification: it
passes FLAKE_UPDATE_TOKEN to create-pull-request directly rather than reusing
.git/config, so it very likely does not need persistence, but that is unproven
and a broken weekly bot is not worth the guess. Both carry a
persist-credentials-exempt comment saying which.

scripts/security/check_persist_credentials.sh requires every checkout to either
clear its credentials or carry that comment, so the decision stays visible in
review rather than being an omission nobody notices.

Refs: rustfs/backlog#1598, rustfs/backlog#1602

.github/workflows/ci.yml

@@ -95,6 +95,8 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
       - name: Typos check with custom config file
         uses: crate-ci/typos@37bb98842b0d8c4ffebdb75301a13db0267cef89 # master
 
@@ -112,6 +114,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Install ripgrep
         run: sudo apt-get update && sudo apt-get install -y ripgrep
@@ -353,6 +357,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -391,6 +397,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -433,6 +441,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -461,6 +471,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -492,6 +504,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -532,6 +546,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -594,6 +610,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       # Full setup with dependency caching: the smoke-suite step below
       # compiles the e2e_test crate, which pulls in most of the workspace.
@@ -678,6 +696,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -721,6 +741,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Clean up previous test run
         run: |
@@ -775,6 +797,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Download debug binary
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
@@ -847,6 +871,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
 
       - name: Download debug binary
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7