Update Dockerfile

Dockerfile

@@ -29,13 +29,15 @@ RUN wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | apt-key add
     && apt-get install -y google-chrome-stable \
     && rm -rf /var/lib/apt/lists/*
 
-# ---- runtime writable caches ---------------------------------
-ENV HOME=/root \
+# -------------------------------------------------------------
+#  Writable caches for non-root runtime
+# -------------------------------------------------------------
+ENV HOME=/tmp \
     MPLCONFIGDIR=/tmp/matplotlib \
     XDG_CACHE_HOME=/tmp/fontcache \
-    PLAYWRIGHT_BROWSERS_PATH=/root/.cache/ms-playwright
-RUN mkdir -p /tmp/matplotlib /tmp/fontcache /root/.cache/ms-playwright
-# --------------------------------------------------------------
+    PLAYWRIGHT_BROWSERS_PATH=/tmp/ms-playwright
+RUN mkdir -p /tmp/matplotlib /tmp/fontcache /tmp/ms-playwright \
+    && chmod -R 777 /tmp/matplotlib /tmp/fontcache /tmp/ms-playwright
 
 # Copy requirements file
 COPY requirements.txt .