chore: setup-node v6; add monthly metrics; extend validator inputs title (#293)

* feat: add montly issue stats

* chore: update actions

* fix(stale): use validate-inputs

.github/workflows/issue-stats.yml

@@ -0,0 +1,42 @@
+name: Monthly issue metrics
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '3 2 1 * *'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: issue metrics
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: read
+    steps:
+      - name: Get dates for last month
+        shell: bash
+        run: |
+          # Calculate the first day of the previous month
+          first_day=$(date -d "last month" +%Y-%m-01)
+
+          # Calculate the last day of the previous month
+          last_day=$(date -d "$first_day +1 month -1 day" +%Y-%m-%d)
+
+          #Set an environment variable with the date range
+          echo "$first_day..$last_day"
+          echo "last_month=$first_day..$last_day" >> "$GITHUB_ENV"
+
+      - name: Run issue-metrics tool
+        uses: github/issue-metrics@c640329f02bd24b12b91d51cd385f0b1c25cefb9 # v3.25.1
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SEARCH_QUERY: 'repo:ivuorinen/actions is:issue created:${{ env.last_month }} -reason:"not planned"'
+
+      - name: Create issue
+        uses: peter-evans/create-issue-from-file@fca9117c27cdc29c6c4db3b86c48e4115a786710 # v6.0.0
+        with:
+          title: Monthly issue metrics report
+          token: ${{ secrets.GITHUB_TOKEN }}
+          content-filepath: ./issue_metrics.md