Use CA bundle instead of single certificates, make auto update URL configurable

ci/Dockerfile

@@ -0,0 +1,15 @@
+# Use the official Python 3.9 image as the base
+FROM python:3.9-slim
+
+# Set the working directory
+WORKDIR /workspace
+
+RUN apt-get update && apt-get install -y git
+
+# Install PlatformIO
+RUN pip install platformio
+
+WORKDIR /usr/src
+
+CMD ["platformio", "run"]
+