Adds ffmpeg and ngrok to docker

build/hassio/Dockerfile

@@ -1,11 +1,19 @@
 ARG BUILD_FROM
 FROM $BUILD_FROM
 
-RUN apk add --no-cache git go
+RUN apk add --no-cache git go ffmpeg
+
+ARG BUILD_ARCH
 
 WORKDIR app
 
 RUN git clone https://github.com/AlexxIT/go2rtc .
 RUN CGO_ENABLED=0 go build -ldflags "-s -w" -trimpath
 
+# 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 \
+    && curl $(curl -s "https://raw.githubusercontent.com/ngrok/docker-ngrok/main/releases.json" | jq -r ".${BUILD_ARCH}.url") -o ngrok.zip \
+    && unzip ngrok
+
 CMD [ "/app/go2rtc", "-config", "/config/go2rtc.yaml" ]