Feat: Dockerize tokei (#930)

* Dockerize tokei

* Update README.md with how to run tokei docker

* Simplify compiler flags

* Remove superfluous dependency to libgcc

* Use Earthfile instead of Dockerfile

* Remove superfluous referencing of build step

This is not needed because it is implied.

Co-authored-by: XAMPPRocky <4464295+XAMPPRocky@users.noreply.github.com>

---------

Co-authored-by: XAMPPRocky <4464295+XAMPPRocky@users.noreply.github.com>

Earthfile

@@ -0,0 +1,24 @@
+VERSION 0.6
+FROM alpine:3.14
+WORKDIR /src
+
+build:
+    FROM rust:alpine3.14
+    RUN apk update \
+        && apk add \
+            git \
+            gcc \
+            g++ \
+            pkgconfig
+
+    COPY . /src
+    WORKDIR /src
+    RUN cargo build --release
+    SAVE ARTIFACT /src/target/release/tokei AS LOCAL ./tokei
+
+docker:
+    COPY +build/tokei /usr/local/bin/
+    WORKDIR /src
+    ENTRYPOINT [ "tokei" ]
+    CMD [ "--help" ]
+    SAVE IMAGE tokei

README.md

@@ -297,6 +297,22 @@ Example show total lines:
 
 The server code hosted on tokei.rs is in [XAMPPRocky/tokei_rs](https://github.com/XAMPPRocky/tokei_rs)
 
+## Dockerized version
+Tokei is available in a small `alpine`-based docker image, buildable through:
+```bash
+earthly +docker
+```
+
+Once built, one can run the image with:
+```bash
+docker run --rm -v /path/to/analyze:/src tokei .
+```
+
+Or, to simply analyze the current folder (linux):
+```bash
+docker run --rm -v $(pwd):/src tokei .
+```
+
 ## Supported Languages
 
 If there is a language that you would to add to tokei feel free to make a pull