Add support arm/v6 to Dockerfile

Dockerfile

@@ -3,13 +3,18 @@
 # 0. Prepare images
 ARG PYTHON_VERSION="3.11"
 ARG GO_VERSION="1.22"
-ARG NGROK_VERSION="3"
 
-FROM python:${PYTHON_VERSION}-alpine AS base
-FROM ngrok/ngrok:${NGROK_VERSION}-alpine AS ngrok
 
+# 1. Download ngrok binary (for support arm/v6)
+FROM alpine AS ngrok
+ARG TARGETARCH
+ARG TARGETOS
+
+ADD https://bin.equinox.io/c/bNyj1mQVY4c/ngrok-v3-stable-${TARGETOS}-${TARGETARCH}.tgz /
+RUN tar -xzf /ngrok-v3-stable-${TARGETOS}-${TARGETARCH}.tgz -C /bin
 
-# 1. Build go2rtc binary
+
+# 2. Build go2rtc binary
 FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine AS build
 ARG TARGETPLATFORM
 ARG TARGETOS
@@ -30,15 +35,8 @@ COPY . .
 RUN --mount=type=cache,target=/root/.cache/go-build CGO_ENABLED=0 go build -ldflags "-s -w" -trimpath
 
 
-# 2. Collect all files
-FROM scratch AS rootfs
-
-COPY --from=build /build/go2rtc /usr/local/bin/
-COPY --from=ngrok /bin/ngrok /usr/local/bin/
-
-
 # 3. Final image
-FROM base
+FROM python:${PYTHON_VERSION}-alpine AS base
 
 # Install ffmpeg, tini (for signal handling),
 # and other common tools for the echo source.
@@ -56,7 +54,8 @@ RUN if [ "${TARGETARCH}" = "amd64" ]; then apk add --no-cache libva-intel-driver
 # Hardware: AMD and NVidia VDPAU (not sure about this)
 # RUN libva-vdpau-driver mesa-vdpau-gallium (+150MB total)
 
-COPY --from=rootfs / /
+COPY --from=build /build/go2rtc /usr/local/bin/
+COPY --from=ngrok /bin/ngrok /usr/local/bin/
 
 ENTRYPOINT ["/sbin/tini", "--"]
 VOLUME /config