Add git version to /api endpoint response

docker/Dockerfile

@@ -2,6 +2,11 @@ FROM python:3.11
 
 WORKDIR /app
 
+# Install system dependencies including git
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
 # Install Python dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt

prs/routes/api.py

@@ -19,9 +19,19 @@
 )
 from fastapi.responses import HTMLResponse, RedirectResponse, Response
 from prs.configs import BASE_URL, PORT, READIUM_HOST_PORT
+import subprocess
 
 router = APIRouter()
 
+def get_git_revision_short_hash():
+    try:
+        return subprocess.check_output(
+            ["git", "rev-parse", "--short", "HEAD"],
+            cwd=None
+        ).decode("ascii").strip()
+    except Exception:
+        return None
+
 def ia_get_epub_filepath(item_id):
     if '$' in item_id:
         item_id, filepath = item_id.replace('$', '/').split('/', 1)
@@ -53,7 +63,9 @@ def prs_uri(request: Request):
 
 @router.get('/', status_code=status.HTTP_200_OK)
 async def apis(request: Request):
+    version = get_git_revision_short_hash()
     return {
+        "version": version,
         f"{prs_uri(request)}/api": {
             "description": "List all APIs",
         },