dowload tesseract data during docker build (#40)

Dockerfile

@@ -1,5 +1,7 @@
 FROM mcr.microsoft.com/dotnet/sdk:6.0 AS builder
 
+ARG LANGUAGE=eng
+
 RUN apt-get -y update && \
   apt-get -y upgrade && \
   apt-get -y install \
@@ -10,9 +12,11 @@ RUN apt-get -y update && \
     libtesseract4 \
     make \
     pkg-config \
-    libc6-dev
+    wget \
+    libc6-dev && \
+    mkdir tessdata && \
+    wget https://github.com/tesseract-ocr/tessdata/raw/main/${LANGUAGE}.traineddata -O ./tessdata/eng.traineddata
 
-ARG LANGUAGE=eng
 COPY ./tessdata/${LANGUAGE}.traineddata /tessdata/
 COPY ./src /src
 
@@ -31,9 +35,5 @@ COPY --from=builder /src/PgsToSrt/out .
 COPY --from=builder /tessdata /tessdata
 COPY ./src/entrypoint.sh /entrypoint.sh
 
-RUN apt-get -y update && \
-  apt-get -y install \
-    libtesseract4
-
 # Docker for Windows: EOL must be LF.
 ENTRYPOINT /entrypoint.sh