Migrate from CircleCI to Github actions

We can use across all the repositories of plugins and apps
the same reusable workflow which give us the ability to change only one file instead
of multiple and apart from this the ability to use different versions as we prefer.

Ticket: https://mattermost.atlassian.net/browse/CLD-4816

.github/workflows/cd.yml

@@ -0,0 +1,17 @@
+name: cd
+on:
+  workflow_run:
+    workflows: ["ci"]
+    types:
+      - completed
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+
+permissions:
+  contents: read
+
+jobs:
+  plugin-cd:
+    uses: mattermost/actions-workflows/.github/workflows/plugin-cd.yml@master
+    secrets: inherit

.github/workflows/ci.yml

@@ -1,77 +1,18 @@
-# Continuous Integration Workflow to check pushes to master and pull requests:
-# - code style guidelines are followed (make check-style)
-# - tests pass (make test)
-# - code builds (make dist)
-name: CI
-
+name: ci
 on:
-  pull_request:
+  schedule: # nightly builds
+    - cron: "0 0 * * *"
   push:
     branches:
       - master
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+  pull_request:
 
-jobs:
-  ci:
-    name: Check style; build; test
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Set up Go v1.16.x
-        uses: actions/setup-go@v2
-        with:
-          go-version: 1.16.x
-
-      - name: Set up Node.js v14.x
-        uses: actions/setup-node@v1
-        with:
-          node-version: 14.x
-
-      - uses: actions/checkout@v2
-
-      - name: Install golangci
-        run: curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.49.0
-
-      - name: Cache go modules
-        uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
-
-      - name: Cache node modules
-        uses: actions/cache@v2
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node-
-
-      - name: Install webapp dependencies
-        run: make webapp/node_modules
-        env:
-          TERM: dumb
-
-      - name: check style
-        run: make check-style
-        env:
-          TERM: dumb
-
-      - name: run tests
-        run: make test
-        env:
-          TERM: dumb
-
-      - name: Build and bundle the plugin
-        id: build
-        run: |
-          make dist
-          echo ::set-output name=BUNDLE_NAME::$(cd dist; ls *.tar.gz)
-        env:
-          TERM: dumb
+permissions:
+  contents: read
 
-      - name: Upload the built plugin as an artifact
-        uses: actions/upload-artifact@v2
-        with:
-          name: ${{ steps.build.outputs.BUNDLE_NAME }}
-          path: dist/${{ steps.build.outputs.BUNDLE_NAME }}
+jobs:
+  plugin-ci:
+    uses: mattermost/actions-workflows/.github/workflows/plugin-ci.yml@master
+    secrets: inherit