Added docker dev env

Author: s-m-i-t-a

.dockerignore

@@ -0,0 +1,88 @@
+# This file excludes paths from the Docker build context.
+#
+# By default, Docker's build context includes all files (and folders) in the
+# current directory. Even if a file isn't copied into the container it is still sent to
+# the Docker daemon.
+#
+# There are multiple reasons to exclude files from the build context:
+#
+# 1. Prevent nested folders from being copied into the container (ex: exclude
+#    /assets/node_modules when copying /assets)
+# 2. Reduce the size of the build context and improve build time (ex. /build, /deps, /doc)
+# 3. Avoid sending files containing sensitive information
+#
+# More information on using .dockerignore is available here:
+# https://docs.docker.com/engine/reference/builder/#dockerignore-file
+
+.dockerignore
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+.fetch
+
+# Ignore package tarball (built via "mix hex.build").
+qr_code-*.tar
+
+# If NPM crashes, it generates a log, let's ignore it too.
+npm-debug.log
+
+# The directory NPM downloads your dependencies sources to.
+assets/node_modules/
+
+# Since we are building assets from assets/,
+# we ignore priv/static. You may want to comment
+# this depending on your deployment strategy.
+priv/static/
+/priv/static/assets/
+/priv/static/cache_manifest.json
+
+# Ignore dialyzer tables
+priv/plts/*.plt
+priv/plts/*.plt.hash
+
+# Ignore git, but keep git HEAD and refs to access current commit hash if needed:
+#
+# $ cat .git/HEAD | awk '{print ".git/"$2}' | xargs cat
+# d0b8727759e1e0e7aa3d41707d12376e373d5ecc
+.git
+!.git/HEAD
+!.git/refs
+.github/
+.gitignore
+
+# Common development/test artifacts
+/cover/
+/doc/
+/test/
+/tmp/
+.elixir_ls
+
+# Mix artifacts
+/_build/
+/deps/
+*.ez
+
+# Generated on crash by the VM
+erl_crash.dump
+
+# Backup
+*~
+
+/tmp/
+/.env/
+.env*
+.vimrc
+.projections.json
+.editorconfig
+.bumpversion.cfg
+.vscode/
+README*
+
+# tags
+tags
+tags.*
+*.tags
+
+.DS_Store
+
+# docker
+Dockerfile

Dockerfile

@@ -0,0 +1,18 @@
+FROM elixir:1.14
+
+RUN apt update -y \
+    && apt install -y \
+      inotify-tools
+
+RUN mix local.rebar --force \
+    && mix local.hex --force
+
+COPY mix.exs /usr/src/app/
+COPY mix.lock /usr/src/app/
+WORKDIR /usr/src/app
+RUN mix do deps.get, deps.compile
+
+COPY . /usr/src/app
+RUN mix compile
+
+CMD ["iex", "-S", "mix"]

docker-compose.yml

@@ -0,0 +1,23 @@
+version: '3'
+services:
+  qr_code:
+    image: qrcode:dev
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ./tmp/erlang-history:/root/.cache/erlang-history
+      - ./config:/usr/src/app/config
+      - ./lib:/usr/src/app/lib
+      - ./priv:/usr/src/app/priv
+      - ./mix.exs:/usr/src/app/mix.exs
+      - ./mix.lock:/usr/src/app/mix.lock
+      - ./test:/usr/src/app/test
+      - elixir_build:/usr/src/app/_build
+      - elixir_deps:/usr/src/app/deps
+      - elixir_dialyzer:/usr/src/app/priv/plts
+
+volumes:
+  elixir_build:
+  elixir_deps:
+  elixir_dialyzer: