feat: initial client code

This creates the initial code (minus the tests, which require server
code) as pulled from the discovery-service repository.

Discovery client depends on `discovery-api` for protobufs and generated
code.

Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>

.codecov.yml

@@ -0,0 +1,18 @@
+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-10-13T15:57:43Z by kres 2a27963-dirty.
+
+codecov:
+  require_ci_to_pass: false
+
+coverage:
+  status:
+    project:
+      default:
+        target: 30%
+        threshold: 0.5%
+        base: auto
+        if_ci_failed: success
+    patch: off
+
+comment: false

.conform.yaml

@@ -0,0 +1,39 @@
+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-10-13T15:57:43Z by kres 2a27963-dirty.
+
+---
+policies:
+- type: commit
+  spec:
+    dco: true
+    gpg:
+      required: true
+      identity:
+        gitHubOrganization: talos-systems
+    spellcheck:
+      locale: US
+    maximumOfOneCommit: true
+    header:
+      length: 89
+      imperative: true
+      case: lower
+      invalidLastCharacters: .
+    body:
+      required: true
+    conventional:
+      types: ["chore","docs","perf","refactor","style","test","release"]
+      scopes: [".*"]
+- type: license
+  spec:
+    skipPaths:
+      - .git/
+    includeSuffixes:
+      - .go
+    excludeSuffixes:
+      - .pb.go
+      - .pb.gw.go
+    header: |
+      // This Source Code Form is subject to the terms of the Mozilla Public
+      // License, v. 2.0. If a copy of the MPL was not distributed with this
+      // file, You can obtain one at http://mozilla.org/MPL/2.0/.

.dockerignore

@@ -0,0 +1,11 @@
+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-10-13T17:42:34Z by kres 2a27963-dirty.
+
+**
+!pkg
+!go.mod
+!go.sum
+!.golangci.yml
+!README.md
+!.markdownlint.json

.drone.yml

@@ -0,0 +1,244 @@
+---
+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-10-13T15:57:43Z by kres 2a27963-dirty.
+
+kind: pipeline
+type: kubernetes
+name: default
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: setup-ci
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - sleep 5
+  - git fetch --tags
+  - install-ci-key
+  - docker buildx create --driver docker-container --platform linux/amd64 --name local --use unix:///var/outer-run/docker.sock
+  - docker buildx inspect --bootstrap
+  environment:
+    SSH_KEY:
+      from_secret: ssh_key
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+
+- name: base
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make base
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  depends_on:
+  - setup-ci
+
+- name: unit-tests
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make unit-tests
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  depends_on:
+  - base
+
+- name: unit-tests-race
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make unit-tests-race
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  depends_on:
+  - base
+
+- name: coverage
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make coverage
+  environment:
+    CODECOV_TOKEN:
+      from_secret: CODECOV_TOKEN
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  depends_on:
+  - unit-tests
+
+- name: lint
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make lint
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  depends_on:
+  - base
+
+- name: release-notes
+  pull: always
+  image: autonomy/build-container:latest
+  commands:
+  - make release-notes
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  when:
+    event:
+    - tag
+  depends_on:
+  - unit-tests
+  - coverage
+  - lint
+
+- name: release
+  pull: always
+  image: plugins/github-release
+  settings:
+    api_key:
+      from_secret: github_token
+    checksum:
+    - sha256
+    - sha512
+    draft: true
+    files:
+    - _out/*
+    note: _out/RELEASE_NOTES.md
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+  when:
+    event:
+    - tag
+  depends_on:
+  - release-notes
+
+services:
+- name: docker
+  image: docker:20.10-dind
+  entrypoint:
+  - dockerd
+  commands:
+  - --dns=8.8.8.8
+  - --dns=8.8.4.4
+  - --mtu=1500
+  - --log-level=error
+  privileged: true
+  volumes:
+  - name: outer-docker-socket
+    path: /var/outer-run
+  - name: docker-socket
+    path: /var/run
+  - name: buildx
+    path: /root/.docker/buildx
+  - name: ssh
+    path: /root/.ssh
+
+volumes:
+- name: outer-docker-socket
+  host:
+    path: /var/ci-docker
+- name: docker-socket
+  temp:
+    medium: memory
+- name: buildx
+  temp:
+    medium: memory
+- name: ssh
+  temp:
+    medium: memory
+
+---
+kind: pipeline
+type: kubernetes
+name: notify
+
+platform:
+  os: linux
+  arch: amd64
+
+clone:
+  disable: true
+
+steps:
+- name: slack
+  image: plugins/slack
+  settings:
+    channel: proj-talos-maintainers
+    link_names: true
+    template: "{{#if build.pull }}\n*{{#success build.status}}✓ Success{{else}}✕ Fail{{/success}}*: {{ repo.owner }}/{{ repo.name }} - <https://github.com/{{ repo.owner }}/{{ repo.name }}/pull/{{ build.pull }}|Pull Request #{{ build.pull }}>\n{{else}}\n*{{#success build.status}}✓ Success{{else}}✕ Fail{{/success}}: {{ repo.owner }}/{{ repo.name }} - Build #{{ build.number }}* (type: `{{ build.event }}`)\n{{/if}}\nCommit: <https://github.com/{{ repo.owner }}/{{ repo.name }}/commit/{{ build.commit }}|{{ truncate build.commit 8 }}>\nBranch: <https://github.com/{{ repo.owner }}/{{ repo.name }}/commits/{{ build.branch }}|{{ build.branch }}>\nAuthor: {{ build.author }}\n<{{ build.link }}|Visit build page>"
+    webhook:
+      from_secret: slack_webhook
+  when:
+    status:
+    - success
+    - failure
+
+trigger:
+  status:
+  - success
+  - failure
+
+depends_on:
+- default
+
+...

.gitignore

@@ -0,0 +1,5 @@
+# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
+#
+# Generated on 2021-10-13T15:57:43Z by kres 2a27963-dirty.
+
+_out