refactor: Update Dockerfile to improve ugrep build process

Author: mmgordon82

Diff for: Dockerfile

@@ -1,25 +1,31 @@
-# step 1: create a debian or ubuntu container for ugrep named "ugrep"
-# docker -D build --no-cache -t ugrep .
 #
-# step 2: run bash in the container, e.g. to run ugrep from the command line
-# docker run -it ugrep bash
-# or
-# docker run -it --mount type=bind,source=$PWD,target=/mnt ugrep bash
+# Dockerfile to build and run ugrep in a container (development environment).
 #
-# step 3: run ugrep in the container, for example:
-# ugrep -r -n -tjava Hello ugrep/tests/
+# This file creates the environment to build and run ugrep in a container. If
+# you just want to use ugrep in a minimal container, use the minimized Dockerfile. 
+#
+# Build the ugrep image:
+#   $ docker build -t ugrep .
+#
+# Execute ugrep in the container (The / of the host is accessible in /mnt directory in the container):
+#   $ docker run -v /:/mnt -it ugrep --help
+# or run bash in the container instead:
+#   $ docker run -v /:/mnt --entrypoint /bin/bash -it ugrep
+#   $ ugrep --help
 
-# debian or ubuntu
 FROM ubuntu
 
 RUN apt-get update
 
-RUN apt-get install -y \
+RUN apt-get install -y --no-install-recommends \
+    autoconf \
+    automake \
+    build-essential \
+    ca-certificates \
+    pkg-config \
     make \
-    vim \
     git \
     clang \
-    wget \
     unzip \
     libpcre2-dev \
     libz-dev \
@@ -29,9 +35,18 @@ RUN apt-get install -y \
     libzstd-dev \
     libbrotli-dev
 
-RUN cd / && \
-    git clone https://github.com/Genivia/ugrep
+WORKDIR /ugrep
+
+# Clone ugrep from GitHub
+RUN git clone --single-branch --depth=1 https://github.com/Genivia/ugrep /ugrep
+
+# Local build of ugrep
+# If you want to build ugrep from a local source, uncomment the following line:
+# ADD . /ugrep
+
+RUN autoreconf -fi
+RUN ./build.sh
+RUN make install
+RUN ugrep --version
 
-RUN cd ugrep && \
-    ./build.sh && \
-    make install
+ENTRYPOINT [ "ugrep" ]