CI-12 review: INFRA_READ_TOKEN via an env-set header, not a remote URL

The long-lived token no longer lands in $WS/goodwe/.git/config (mounted into
the tests' container, left behind by a failed job) or in git's argv. A missing
secret (fork PR) fails with its own message. README: addon-pin is not re-run
after a bump.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyR88rXETvwhTgx6yHE39p

.gitea/workflows/infra-pin.yml

@@ -23,13 +23,15 @@ jobs:
           INFRA_TOKEN: ${{ secrets.INFRA_READ_TOKEN }}   # admin/goodwe is private
         run: |
           set -eu
-          auth() { echo "$1" | sed "s#://#://x-access-token:${2:-$TOKEN}@#"; }
           D=$(mktemp -d) && cd "$D"
-          git init -q . && git remote add origin "$(auth "$SELF")"
+          git init -q . && git remote add origin "$(echo "$SELF" | sed "s#://#://x-access-token:${TOKEN}@#")"
           # The pin of the commit this event is about (the PR head, or the push).
           git fetch -q --depth 1 origin "$GITHUB_SHA"
           PIN=$(git show FETCH_HEAD:.gitea/infra-pin | grep -v '^#' | tr -d '[:space:]')
-          HEAD=$(git ls-remote "$(auth "$INFRA" "$INFRA_TOKEN")" refs/heads/release/1.0 | cut -f1)
+          test -n "$INFRA_TOKEN" || { echo "FAIL: secret INFRA_READ_TOKEN is not available to this run (a fork PR?)."; exit 1; }
+          # Header via env, as in checks.yml: the token stays out of argv.
+          HEAD=$(GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0=http.extraHeader GIT_CONFIG_VALUE_0="Authorization: token $INFRA_TOKEN" \
+            git ls-remote "$INFRA" refs/heads/release/1.0 | cut -f1)
           cd / && rm -rf "$D"
           test -n "$HEAD" || { echo "FAIL: could not read admin/goodwe release/1.0."; exit 1; }
           if [ "$PIN" != "$HEAD" ]; then