$ docker build -t linguist .
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
STEP 1/3: FROM ruby:2-alpine3.13
✔ docker.io/library/ruby:2-alpine3.13
Trying to pull docker.io/library/ruby:2-alpine3.13...
Getting image source signatures
Copying blob dc7e2bfec2fe done   |
Copying blob c86e849bc66e done   |
Copying blob 5758d4e389a3 done   |
Copying blob 94a2fc84ba5b done   |
Copying blob b33877ba8182 done   |
Copying config 696fe92548 done   |
Writing manifest to image destination
STEP 2/3: RUN apk --update add --virtual build_deps     build-base     libc-dev     cmake     && apk add icu-dev openssl-dev     && gem install github-linguist     && apk del build_deps       && rm /var/cache/apk/*
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/community/x86_64/APKINDEX.tar.gz
(1/32) Upgrading musl (1.2.2-r1 -> 1.2.2-r2)
(2/32) Installing binutils (2.35.2-r1)
(3/32) Installing libmagic (5.39-r0)
(4/32) Installing file (5.39-r0)
(5/32) Installing libgomp (10.2.1_pre1-r3)
(6/32) Installing libatomic (10.2.1_pre1-r3)
(7/32) Installing libgphobos (10.2.1_pre1-r3)
(8/32) Installing isl22 (0.22-r0)
(9/32) Installing mpfr4 (4.1.0-r0)
(10/32) Installing mpc1 (1.2.0-r0)
(11/32) Installing gcc (10.2.1_pre1-r3)
(12/32) Installing musl-dev (1.2.2-r2)
(13/32) Installing libc-dev (0.7.2-r3)
(14/32) Installing g++ (10.2.1_pre1-r3)
(15/32) Installing make (4.3-r0)
(16/32) Installing fortify-headers (1.1-r0)
(17/32) Installing patch (2.7.6-r7)
(18/32) Installing build-base (0.5-r3)
(19/32) Installing libacl (2.2.53-r0)
(20/32) Installing libbz2 (1.0.8-r1)
(21/32) Installing expat (2.2.10-r8)
(22/32) Installing lz4-libs (1.9.2-r1)
(23/32) Installing xz-libs (5.2.5-r1)
(24/32) Installing zstd-libs (1.4.9-r0)
(25/32) Installing libarchive (3.5.3-r0)
(26/32) Installing brotli-libs (1.0.9-r3)
(27/32) Installing nghttp2-libs (1.42.0-r1)
(28/32) Installing libcurl (7.79.1-r3)
(29/32) Installing rhash-libs (1.4.1-r0)
(30/32) Installing libuv (1.40.0-r0)
(31/32) Installing cmake (3.18.4-r1)
(32/32) Installing build_deps (20241214.122056)
Executing busybox-1.32.1-r7.trigger
OK: 256 MiB in 67 packages
(1/6) Upgrading libcrypto1.1 (1.1.1l-r0 -> 1.1.1s-r0)
(2/6) Upgrading libssl1.1 (1.1.1l-r0 -> 1.1.1s-r0)
(3/6) Installing icu-libs (67.1-r2)
(4/6) Installing icu (67.1-r2)
(5/6) Installing icu-dev (67.1-r2)
(6/6) Installing openssl-dev (1.1.1s-r0)
Executing busybox-1.32.1-r7.trigger
Executing ca-certificates-20191127-r5.trigger
OK: 294 MiB in 71 packages
Building native extensions. This could take a while...
Successfully installed rugged-1.7.2
Successfully installed mini_mime-1.1.5
Building native extensions. This could take a while...
Successfully installed charlock_holmes-0.7.9
Building native extensions. This could take a while...
Successfully installed github-linguist-9.0.0
4 gems installed
(1/31) Purging build_deps (20241214.122056)
(2/31) Purging build-base (0.5-r3)
(3/31) Purging file (5.39-r0)
(4/31) Purging g++ (10.2.1_pre1-r3)
(5/31) Purging gcc (10.2.1_pre1-r3)
(6/31) Purging binutils (2.35.2-r1)
(7/31) Purging libatomic (10.2.1_pre1-r3)
(8/31) Purging libgomp (10.2.1_pre1-r3)
(9/31) Purging libgphobos (10.2.1_pre1-r3)
(10/31) Purging make (4.3-r0)
(11/31) Purging fortify-headers (1.1-r0)
(12/31) Purging patch (2.7.6-r7)
(13/31) Purging libc-dev (0.7.2-r3)
(14/31) Purging musl-dev (1.2.2-r2)
(15/31) Purging cmake (3.18.4-r1)
(16/31) Purging libmagic (5.39-r0)
(17/31) Purging isl22 (0.22-r0)
(18/31) Purging mpc1 (1.2.0-r0)
(19/31) Purging mpfr4 (4.1.0-r0)
(20/31) Purging libarchive (3.5.3-r0)
(21/31) Purging libacl (2.2.53-r0)
(22/31) Purging libbz2 (1.0.8-r1)
(23/31) Purging expat (2.2.10-r8)
(24/31) Purging lz4-libs (1.9.2-r1)
(25/31) Purging xz-libs (5.2.5-r1)
(26/31) Purging zstd-libs (1.4.9-r0)
(27/31) Purging libcurl (7.79.1-r3)
(28/31) Purging brotli-libs (1.0.9-r3)
(29/31) Purging nghttp2-libs (1.42.0-r1)
(30/31) Purging rhash-libs (1.4.1-r0)
(31/31) Purging libuv (1.40.0-r0)
Executing busybox-1.32.1-r7.trigger
OK: 58 MiB in 40 packages
--> eeb2bda5e5f3
STEP 3/3: CMD ["github-linguist"]
COMMIT linguist
--> 308ce43e0a3b
Successfully tagged localhost/linguist:latest
308ce43e0a3bac6e52b5fa9b6ebb4868d3444f43b5921aade1e224ebac3501bf

$ docker run --rm -v $(pwd):$(pwd) -w $(pwd) -t linguist
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
Traceback (most recent call last):
        4: from /usr/local/bundle/bin/github-linguist:23:in `<main>'
        3: from /usr/local/bundle/bin/github-linguist:23:in `load'
        2: from /usr/local/bundle/gems/github-linguist-9.0.0/bin/github-linguist:155:in `<top (required)>'
        1: from /usr/local/bundle/gems/github-linguist-9.0.0/bin/github-linguist:55:in `github_linguist'
/usr/local/bundle/gems/github-linguist-9.0.0/bin/github-linguist:55:in `new': could not find repository at '/home/vorburger/git/github.com/github-linguist/linguist' (Rugged::RepositoryError)