update dockerfile with oled supported

Dockerfile

@@ -1,9 +1,18 @@
 FROM arm32v7/python:alpine
 
+WORKDIR /code
+
+# linux-headers fix the issue of "spidev_module.c:33:10: fatal error: linux/spi/spidev.h: No such file or directory
+   #include <linux/spi/spidev.h>"
 RUN apk update \
-    && apk add --update --no-cache alpine-sdk py-pip libusb-dev\
-    && pip install RPi.GPIO pyusb
+    && apk add --update --no-cache alpine-sdk build-base linux-headers py-pip libusb-dev python-dev \
+    py3-setuptools zlib-dev
 
-VOLUME [ "/code" ]
+RUN python -m pip install --upgrade pip setuptools \
+    && pip install RPi.GPIO pyusb smbus2 Adafruit-SSD1306
 
-CMD python code/x.py
+RUN pip install pillow --global-option="build_ext" --global-option="--disable-jpeg"
+
+ADD x.py /code
+
+CMD python x.py

x.py

@@ -107,7 +107,7 @@ def draw_stats(disp, draw, image):
     draw.rectangle((0, 0, width, height), outline=0, fill=0)
 
     # Shell scripts for system monitoring from here : https://unix.stackexchange.com/questions/119126/command-to-display-memory-usage-disk-usage-and-cpu-load
-    cmd = "hostname -I | cut -d' ' -f1"
+    cmd = "hostname -i | cut -d' ' -f1"
     IP = subprocess.check_output(cmd, shell=True)
     cmd = "top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"
     CPU = subprocess.check_output(cmd, shell=True)