Reduce docker container size and add python inside

build/hassio/Dockerfile

@@ -1,23 +1,40 @@
 ARG BUILD_FROM
-FROM $BUILD_FROM
 
-RUN apk add --no-cache git go ffmpeg
+FROM $BUILD_FROM as build
 
-ARG BUILD_ARCH
+# 1. Build go2rtc
+RUN apk add --no-cache git go
 
 RUN git clone https://github.com/AlexxIT/go2rtc \
     && cd go2rtc \
-    && CGO_ENABLED=0 go build -ldflags "-s -w" -trimpath -o /usr/local/bin
+    && CGO_ENABLED=0 go build -ldflags "-s -w" -trimpath
+
+# 2. Download ngrok
+ARG BUILD_ARCH
 
 # https://github.com/home-assistant/docker-base/blob/master/alpine/Dockerfile
 RUN if [ "${BUILD_ARCH}" = "aarch64" ]; then BUILD_ARCH="arm64"; \
     elif [ "${BUILD_ARCH}" = "armv7" ]; then BUILD_ARCH="arm"; fi \
     && cd go2rtc \
     && curl $(curl -s "https://raw.githubusercontent.com/ngrok/docker-ngrok/main/releases.json" | jq -r ".${BUILD_ARCH}.url") -o ngrok.zip \
-    && unzip ngrok -d /usr/local/bin
+    && unzip ngrok
 
-RUN rm -r /go2rtc
 
+
+# https://devopscube.com/reduce-docker-image-size/
+FROM $BUILD_FROM
+
+# 3. Copy go2rtc and ngrok to release
+COPY --from=build /go2rtc/go2rtc /usr/local/bin
+COPY --from=build /go2rtc/ngrok /usr/local/bin
+
+# 4. Install ffmpeg
+# apk base  OK: 22  MiB in 40  packages
+# ffmpeg    OK: 113 MiB in 110 packages
+# python3   OK: 161 MiB in 114 packages
+RUN apk add --no-cache ffmpeg python3
+
+# 5. Copy run to release
 COPY run.sh /
 RUN chmod a+x /run.sh