feat: GitHub Actions (#367)

* feat: add workflows

* chore: remove Buildkite configurations

* chore: update badges

.github/problem-matchers/eslint-stylish.json

@@ -0,0 +1,22 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "eslint-stylish",
+      "pattern": [
+        {
+          "regexp": "^/app/([^\\s].*)$",
+          "file": 1
+        },
+        {
+          "regexp": "^\\s+(\\d+):(\\d+)\\s+(error|warning|info)\\s+(.*)\\s\\s+(.*)$",
+          "line": 1,
+          "column": 2,
+          "severity": 3,
+          "message": 4,
+          "code": 5,
+          "loop": true
+        }
+      ]
+    }
+  ]
+}

.github/problem-matchers/tsc.json

@@ -0,0 +1,18 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "tsc",
+      "pattern": [
+        {
+          "regexp": "^([^\\s].*)[\\(:](\\d+)[,:](\\d+)(?:\\):\\s+|\\s+-\\s+)(error|warning|info)\\s+TS(\\d+)\\s*:\\s*(.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "severity": 4,
+          "code": 5,
+          "message": 6
+        }
+      ]
+    }
+  ]
+}

.github/renovate.json

@@ -1,5 +1,5 @@
 {
-  "extends": ["config:base", ":preserveSemverRanges", ":disableDependencyDashboard"],
+  "extends": ["config:base", ":preserveSemverRanges", ":disableDependencyDashboard", "helpers:pinGitHubActionDigests"],
   "labels": ["dependencies"],
   "rangeStrategy": "bump",
   "packageRules": [
@@ -27,11 +27,11 @@
       "matchUpdateTypes": ["minor", "patch"],
       "groupName": "Node.js",
       "groupSlug": "nodejs"
+    },
+    {
+      "matchManagers": ["github-actions"]
     }
   ],
-  "buildkite": {
-    "enabled": false
-  },
   "docker-compose": {
     "enabled": false
   }

.github/workflows/cleanup-registry.yml

@@ -0,0 +1,23 @@
+name: Cleanup Registry
+
+on:
+  schedule:
+    - cron: '0 0 * * 1' # https://crontab.guru/#0_0_*_*_1
+  workflow_dispatch:
+
+env:
+  IMAGE_NAMES: arora-discord
+
+jobs:
+  cleanup:
+    name: Cleanup
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete old versions
+        uses: snok/container-retention-policy@455daa39a1817585ad2ef264650d3ff84b1c81d9 # renovate: tag=v1.2.1
+        with:
+          image-names: ${{ env.IMAGE_NAMES }}
+          cut-off: 2 days ago UTC
+          account-type: personal
+          skip-tags: latest,staging
+          token: ${{ secrets.PAT }}