Allow deploy branch selection

.gitignore

@@ -183,3 +183,6 @@ cython_debug/
 
 # Local my2dos project API config
 .my2dos
+
+# Local deployment branch override
+.deploy-branch

deploy.sh

@@ -7,6 +7,8 @@ set -euo pipefail
 #
 # Optional:
 #   DEPLOY_REMOTE=origin DEPLOY_BRANCH=main ./deploy.sh
+#   ./deploy.sh workspace-tenancy
+#   echo workspace-tenancy > .deploy-branch
 #   SKIP_PIP=1 ./deploy.sh
 #   SKIP_COLLECTSTATIC=1 ./deploy.sh
 #   DEPLOY_RESTART_CMD="..." ./deploy.sh
@@ -14,7 +16,19 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 REMOTE="${DEPLOY_REMOTE:-origin}"
-BRANCH="${DEPLOY_BRANCH:-$(git branch --show-current 2>/dev/null || echo main)}"
+BRANCH_SOURCE="current branch"
+if [[ $# -gt 0 && -n "${1:-}" ]]; then
+  BRANCH="$1"
+  BRANCH_SOURCE="command line"
+elif [[ -n "${DEPLOY_BRANCH:-}" ]]; then
+  BRANCH="$DEPLOY_BRANCH"
+  BRANCH_SOURCE="DEPLOY_BRANCH"
+elif [[ -f ".deploy-branch" && -n "$(tr -d '[:space:]' < .deploy-branch)" ]]; then
+  BRANCH="$(tr -d '[:space:]' < .deploy-branch)"
+  BRANCH_SOURCE=".deploy-branch"
+else
+  BRANCH="$(git branch --show-current 2>/dev/null || echo main)"
+fi
 
 if [[ -x ".venv/bin/python" ]]; then
   PY=".venv/bin/python"
@@ -28,9 +42,18 @@ else
 fi
 
 echo "==> Deploy $(pwd)"
+echo "==> Branch: ${BRANCH} (${BRANCH_SOURCE})"
 echo "==> Python: $($PY --version)"
-echo "==> Git Pull: ${REMOTE}/${BRANCH}"
+echo "==> Git Update: ${REMOTE}/${BRANCH}"
 git fetch "$REMOTE" "$BRANCH"
+CURRENT_BRANCH="$(git branch --show-current 2>/dev/null || true)"
+if [[ "$CURRENT_BRANCH" != "$BRANCH" ]]; then
+  if git show-ref --verify --quiet "refs/heads/$BRANCH"; then
+    git checkout "$BRANCH"
+  else
+    git checkout -b "$BRANCH" --track "$REMOTE/$BRANCH"
+  fi
+fi
 git pull --ff-only "$REMOTE" "$BRANCH"
 
 if [[ "${SKIP_PIP:-0}" != "1" ]]; then