chore: modernise the repository a bit (#29)

* Ease booting application for development

docker-compose and user.conf are added because
otherwise there's no support elements for the boot

* Pin specific versions and help Renovate

This way it's easier for us to reason on the updates
semantically.

* Ease moving toward rebar3

Check
https://erlangforums.com/t/what-is-the-best-way-to-deal-with-rebar-lock-files-of-dependencies/2826/15
on a discussion of the benefits of rebar.lock

* Remove useless warning: nowarn_shadow_vars

By default we wanna get warned about these

* Add a few "good practice" compiler warnings

As per https://github.com/kivra/erlang_template

* Approach rebar3: remove some defaults

* Remove xref_check: prefer defaults

The defaults cover a wider range of options

* Add `dialyzer` options

* xref: stop caring about "unused exports"

It's either this or flagging all "interface API" functions
as -ignore_xref, which is potentially more difficult to
maintain. Choices (?)

* Tweak test coverage

* Cleanup

Try to be consistent in whitespace

* Ease owner identification

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# the project is owned by the platform team
+* @kivra/platform-team

.gitignore

@@ -7,4 +7,3 @@ doc
 _build
 *~
 .vscode/
-rebar.lock

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  riak:
+    image: basho/riak-kv:ubuntu-2.2.3
+    ports:
+      - 8081:8081
+    volumes:
+      - ./riak/user.conf:/etc/riak/user.conf
+    healthcheck:
+      test: riak-admin wait-for-service riak_kv
+      interval: 2s
+      timeout: 5s
+      retries: 10

rebar.config

@@ -1,23 +1,28 @@
-{lib_dirs,            ["deps"]}.
-{deps_dir,            ["deps"]}.
 {erl_opts,            [ debug_info
-                      , nowarn_shadow_vars
                       , warnings_as_errors
                       , {platform_define, "^[0-9]+", namespaced_types}
                       , {platform_define, "^18", deprecated_now}
+                      , warn_export_vars
+                      , warn_unused_import
+                      , warn_keywords
                       ]}.
-{xref_checks,         [undefined_function_calls]}.
-{cover_enabled,       true}.
-{cover_print_enabled, true}.
+
+{dialyzer, [
+    {plt_apps, all_deps},
+    incremental,
+    {warnings, [unmatched_returns]}
+]}.
+
+{profiles, [
+  {test, [
+    {cover_enabled, true},
+    {cover_opts, [verbose]}
+  ]}
+]}.
+
 {deps,
- [ { stdlib2
-   , ""
-   , {git, "git@github.com:kivra/stdlib2.git", {branch, "master"}}
-   }
- , { riakc
-   , ""
-   , {git, "git@github.com:kivra/riak-erlang-client.git", {tag, "2.5.4"}}
-   }
+ [ { stdlib2, {git, "git@github.com:kivra/stdlib2.git", {tag, "v1.4.6"}} }
+ , { riakc, {git, "git@github.com:kivra/riak-erlang-client.git", {tag, "2.5.4"}} }
 
  %% Metrics
  , { telemetry, "~> 1.2" }
@@ -35,3 +40,13 @@
     ]},
    {override, hamcrest, [ {plugins, []} ]}
  ]}.
+
+{shell, [{apps, [krc]}]}.
+
+{xref_checks, [
+    undefined_function_calls,
+    undefined_functions,
+    locals_not_used,
+    deprecated_function_calls,
+    deprecated_functions
+]}.

rebar.lock

@@ -0,0 +1,30 @@
+{"1.2.0",
+[{<<"hamcrest">>,
+  {git,"https://github.com/basho/hamcrest-erlang.git",
+       {ref,"ad3dbab419762fc2d5821abb88b989da006b85c6"}},
+  2},
+ {<<"prometheus">>,{pkg,<<"prometheus">>,<<"4.10.0">>},0},
+ {<<"quantile_estimator">>,{pkg,<<"quantile_estimator">>,<<"0.2.1">>},1},
+ {<<"riak_pb">>,
+  {git,"https://github.com/basho/riak_pb",
+       {ref,"08771aba2ce4935b715d32d1b92555efdc3da994"}},
+  1},
+ {<<"riakc">>,
+  {git,"git@github.com:kivra/riak-erlang-client.git",
+       {ref,"675098b50052508ab7be09198b023a2648c061ee"}},
+  0},
+ {<<"stdlib2">>,
+  {git,"git@github.com:kivra/stdlib2.git",
+       {ref,"f5fdd13de0f02d7b1f9482133a7e4bf8cce14974"}},
+  0},
+ {<<"telemetry">>,{pkg,<<"telemetry">>,<<"1.3.0">>},0}]}.
+[
+{pkg_hash,[
+ {<<"prometheus">>, <<"792ADBF0130FF61B5FA8826F013772AF24B6E57B984445C8D602C8A0355704A1">>},
+ {<<"quantile_estimator">>, <<"EF50A361F11B5F26B5F16D0696E46A9E4661756492C981F7B2229EF42FF1CD15">>},
+ {<<"telemetry">>, <<"FEDEBBAE410D715CF8E7062C96A1EF32EC22E764197F70CDA73D82778D61E7A2">>}]},
+{pkg_hash_ext,[
+ {<<"prometheus">>, <<"2A99BB6DCE85E238C7236FDE6B0064F9834DC420DDBD962AAC4EA2A3C3D59384">>},
+ {<<"quantile_estimator">>, <<"282A8A323CA2A845C9E6F787D166348F776C1D4A41EDE63046D72D422E3DA946">>},
+ {<<"telemetry">>, <<"7015FC8919DBE63764F4B4B87A95B7C0996BD539E0D499BE6EC9D7F3875B79E6">>}]}
+].

riak/user.conf

@@ -0,0 +1,3 @@
+storage_backend=memory
+buckets.default.allow_mult=true
+buckets.default.last_write_wins=false