I am trying to create a normal docker's container, where I want to run my awk script. So we came to know we have to install GNU awk in it too, so could you please let me know if there any way we could get it in container itself(which creating os image) rather than installing it separately:
I apologies if I missed something here as I am new to this technology.
There are a couple of gawk-installed docker images publicly available. You may directly use one of them. A few examples: atarumix/gawk5-alpine algas/gawk. I have to note that most (if not all) are not actively maintained.
You may create a Dockerfile and install gawk. Although you mentioned you do not want to have a separate install, it is pretty easy. Consider this for example:
FROM alpine:latest
RUN apk add --no-cache gawk ffmpeg
If you do not want to use that docker file, you may push the generated image to an image repository. After you push the image, you shall be able to use the image directly. Details of push can be found at push reference.