Update docker debian version to use ffmpeg 6.1

transcoder/Dockerfile.dev

@@ -1,10 +1,33 @@
-FROM golang:1.21
+# we use trixie (debian's testing because ffmpeg on latest is v5 and we need v6)
+# https://packages.debian.org/bookworm/ffmpeg for version tracking
+# FROM golang:1.21
+# trixie's golang is also 1.21
+FROM debian:trixie-slim
+# those were copied from https://github.com/docker-library/golang/blob/master/Dockerfile-linux.template
+ENV GOTOOLCHAIN=local
+ENV GOPATH /go
+ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+RUN set -eux; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+	ca-certificates openssl \
+	golang\
+	g++ \
+	gcc \
+	libc6-dev \
+	make \
+	pkg-config
+
+# https://github.com/golang/go/issues/54400
+ENV SSL_CERT_DIR=/etc/ssl/certs
+RUN update-ca-certificates
+
+RUN go install github.com/bokwoon95/wgo@latest
 RUN apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y \
 	ffmpeg libavformat-dev libavutil-dev libswscale-dev libmediainfo-dev \
 	&& apt-get clean autoclean -y \
 	&& apt-get autoremove -y
-RUN go install github.com/bokwoon95/wgo@latest
 WORKDIR /app
 
 # flags for nvidia acceleration on docker < 25.0