Add ghostbike bot as action

.forgejo/workflows/config/config_ghost-bikes.json

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+{
+ "cacheDir": "./cache",
+  "mastodonAuth": {
+    "url": "https://masto.bike/",
+    "dryrun": false,
+    "timeout": 60000
+  },
+  "actions": [
+
+    {
+      "contentWarning": "Ghost bikes",
+      "poiName": "ghost bike",
+      "poisName": "ghost bikes",
+      "report": {
+        "overpassQuery": "nwr[%22memorial%22=%22ghost_bike%22];",
+        "post": "As of {date}, #OpenStreetMap contained information about {total} #ghostBikes.\n\nA #ghostBike is a memorial in the form of a #bicycle painted white.\nIt remembers a cyclist that has been killed by a car and is located near the place of the accident.\n\nOpenStreetMap is a world-wide map that everyone can edit and reuse for free. https://mapcomplete.org/ghostbikes is an editable map based on OpenStreetMap with ghostbikes."
+      },
+        "themeWhitelist": ["ghostbikes"],
+        "numberOfDays": 31,
+        "showTopContributors": true,
+      "showThankYou": false
+    }
+  ]
+}

.forgejo/workflows/ghostbikebot_masto_bike.yml

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+on:
+  schedule:
+    - cron: "0 2 * * 1"
+
+jobs:
+  ghostbikebot_masto_bike:
+    runs-on: [ ubuntu-latest ]
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+          cache: "npm"
+          cache-dependency-path: package-lock.json
+
+      - name: install deps
+        run: npm ci
+        shell: bash
+
+      - name: Create ghostbike overview
+        shell: bash
+        run: npm run start -- ./.forgejo/workflows/config/config_ghost-bikes.json ${{ secrets.GHOSTBIKEBOT_MASTO_BIKE }}