Switch to scratch baseimage for docker

Dockerfile

@@ -1,32 +1,96 @@
-FROM alpine:latest
+FROM ubuntu:latest AS build-stage
 
-RUN apk add --no-cache \
-    go \
-    tesseract-ocr \
-    tesseract-ocr-dev \
-    leptonica-dev \
-    g++ \
-    tesseract-ocr-data-eng \
-    ffmpeg
 
-WORKDIR /src
+# Build tools and dependencies
+RUN apt-get update
+RUN apt-get install -y \
+  g++-10 autoconf make git golang libtool pkg-config wget xz-utils libpng-dev \
+  tesseract-ocr-eng \
+  protobuf-compiler
 
-COPY go.mod go.sum ./
-RUN go mod download && go mod verify
+# FFmpeg static build
+WORKDIR /build/ffmpeg
+RUN wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz
+RUN tar -xvf ffmpeg-git-amd64-static.tar.xz
+RUN mkdir bin
+RUN cp ffmpeg-git-*-amd64-static/ffmpeg bin/ffmpeg
+RUN cp ffmpeg-git-*-amd64-static/ffprobe bin/ffprobe
 
+
+# Leptonica static build ( required for tesseract )
+WORKDIR /build/leptonica
+RUN git clone --depth 1 https://github.com/DanBloomberg/leptonica.git .
+RUN ./autogen.sh
+RUN ./configure '--with-pic' '--disable-shared' '--without-zlib' '--without-jpeg' '--without-libtiff' '--without-giflib' '--without-libwebp' '--without-libwebpmux' '--without-libopenjpeg' '--disable-programs' 'CXX=g++-10' 'CFLAGS=-D DEFAULT_SEVERITY=L_SEVERITY_ERROR -g0 -O3'
+RUN make 
+RUN make install
+
+
+# Tesseract static build
+WORKDIR /build/tesseract
+RUN git clone --depth 1 https://github.com/tesseract-ocr/tesseract.git .
+RUN ./autogen.sh
+RUN ./configure '--with-pic' '--disable-shared' '--disable-legacy' '--disable-graphics' '--disable-openmp' '--without-curl' '--without-archive' '--disable-doc' 'CXX=g++-10' 'CXXFLAGS=-DTESS_EXPORTS -g0 -O3 -ffast-math'
+RUN make
+RUN make install
+
+
+# Subtle static build
+WORKDIR /build/subtle
 COPY . .
-RUN go build -o /bin/subtle ./cmd/subtle
 
-RUN apk del go
+ENV GOPATH=$HOME/go
+ENV PATH=$PATH:$GOPATH/bin
+
+RUN go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+RUN go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+
+RUN make proto
+
+RUN CGO_ENABLED=1 GOOS=linux \
+    go build  -a -tags netgo -ldflags '-extldflags "-static -L/usr/local/lib -ltesseract -lleptonica -lpng -lz"' ./cmd/subtle
+
+
+# Empty volume mount points
+RUN mkdir /volumes
+RUN mkdir /volumes/media
+RUN mkdir /volumes/config
+
+
 
-WORKDIR /media
+FROM alpine:latest AS user-stage
 
-ARG UID=1000
-ARG GID=1000
+# Setup user and group
+ENV UID=1000
+ENV GID=1000
 
-RUN addgroup -g ${GID} docker && \
-  adduser -D -u ${UID} -G docker subtle
+RUN addgroup -g $GID docker
+RUN adduser -S -u $UID -G docker subtle
+
+
+
+FROM scratch
+
+# User and group
+COPY --from=user-stage /etc/passwd /etc/passwd
+COPY --from=user-stage /etc/group /etc/group
 
 USER subtle:docker
 
-CMD ["/bin/subtle"]
+
+# Binaries
+COPY --from=build-stage /build/subtle/subtle /subtle
+
+COPY --from=build-stage /build/ffmpeg/bin/ffmpeg /usr/local/bin/ffmpeg
+COPY --from=build-stage /build/ffmpeg/bin/ffprobe /usr/local/bin/ffprobe
+
+
+# OCR Language data
+COPY --from=build-stage /usr/share/tesseract-ocr/5/tessdata/eng.traineddata /usr/local/share/tessdata/eng.traineddata
+
+
+# Volume mounts
+COPY --from=build-stage /volumes/media /media
+COPY --from=build-stage /volumes/config /config
+
+CMD ["/subtle"]