Update build docker

build/hassio/Dockerfile

@@ -5,16 +5,18 @@ 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
+RUN git clone https://github.com/AlexxIT/go2rtc \
+    && cd go2rtc \
+    && CGO_ENABLED=0 go build -ldflags "-s -w" -trimpath -o /usr/local/bin
 
 # 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
+    && unzip ngrok -d /usr/local/bin
+
+RUN rm -r /go2rtc
 
 COPY run.sh /
 RUN chmod a+x /run.sh