added docker file

Author: aaabhilash97

Dockerfile

@@ -0,0 +1,49 @@
+FROM golang:latest as build-env
+
+RUN apt-get update -qq
+# Install gotesseract system dependecies
+RUN apt-get install -y -qq libtesseract-dev libleptonica-dev
+ENV TESSDATA_PREFIX=/usr/share/tesseract-ocr/4.00/tessdata/
+
+RUN apt-get install -y -qq \
+    tesseract-ocr-eng \
+    tesseract-ocr-deu \
+    tesseract-ocr-jpn
+
+# All these steps will be cached
+RUN mkdir /app-server
+WORKDIR /app-server
+# COPY go.mod and go.sum files to the workspace
+COPY go.mod .
+COPY go.sum .
+# Get dependancies - will also be cached if we won't change mod/sum
+RUN go mod download
+
+# COPY the source code as the last step
+COPY . .
+ARG CI_COMMIT_SHA
+ARG CI_COMMIT_REF_NAME
+# RUN MKDIR -p dist
+# Build the binary
+RUN CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -ldflags "-s -w -X main.gitCommit=$CI_COMMIT_SHA -X main.gitRef=$CI_COMMIT_REF_NAME" -a -installsuffix cgo -o ./app ./cmd/server/main.go
+RUN ./app -version
+
+# <- Second step to build minimal image
+# FROM scratch
+FROM debian
+
+RUN apt-get update 
+RUN apt-get install -y -qq libtesseract-dev libleptonica-dev
+ENV TESSDATA_PREFIX=/usr/share/tesseract-ocr/4.00/tessdata/
+RUN apt-get install -y -qq \
+    tesseract-ocr-eng \
+    tesseract-ocr-deu \
+    tesseract-ocr-jpn
+
+WORKDIR /app-server
+
+COPY --from=build-env /app-server/ /app-server
+
+ENTRYPOINT ["/app-server/app"]
+EXPOSE 3333
+EXPOSE 4444