fix(gitea): ensure python runtime for deploy update job

.gitea/workflows/ci.yml

@@ -236,6 +236,40 @@ jobs:
       pr_url: ${{ steps.create_pr.outputs.pr_url }}
 
     steps:
+      - name: Ensure Python runtime
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          if command -v python3 >/dev/null 2>&1; then
+            :
+          elif command -v python >/dev/null 2>&1; then
+            ln -sf "$(command -v python)" /usr/local/bin/python3
+          elif command -v apk >/dev/null 2>&1; then
+            apk add --no-cache python3 py3-pip
+          elif command -v apt-get >/dev/null 2>&1; then
+            apt-get update
+            apt-get install -y python3 python3-pip
+          else
+            echo "No supported package manager found to install python3" >&2
+            exit 1
+          fi
+
+          if ! python3 -m pip --version >/dev/null 2>&1; then
+            if command -v apk >/dev/null 2>&1; then
+              apk add --no-cache py3-pip
+            elif command -v apt-get >/dev/null 2>&1; then
+              apt-get update
+              apt-get install -y python3-pip
+            else
+              echo "python3 exists but pip is unavailable" >&2
+              exit 1
+            fi
+          fi
+
+          python3 --version
+          python3 -m pip --version
+
       - name: Install PyYAML
         shell: bash
         run: |