feat: add optional date inputs for monthly issue metrics workflow

[skip ci]

Author: SteKoe

.github/workflows/issue-metrics.yml

@@ -1,6 +1,15 @@
 name: Monthly issue metrics
 on:
   workflow_dispatch:
+    inputs:
+      start_date:
+        description: 'Start date (YYYY-MM-DD)'
+        required: false
+        type: string
+      end_date:
+        description: 'End date (YYYY-MM-DD)'
+        required: false
+        type: string
   schedule:
     - cron: "3 2 1 * *"
 
@@ -18,11 +27,17 @@ jobs:
       - name: Get dates for last month
         shell: bash
         run: |
-          # Calculate the first day of the previous month
-          first_day=$(date -d "last month" +%Y-%m-01)
+          # Use input dates if provided, otherwise calculate the previous month
+          if [ -n "${{ inputs.start_date }}" ] && [ -n "${{ inputs.end_date }}" ]; then
+            first_day="${{ inputs.start_date }}"
+            last_day="${{ inputs.end_date }}"
+          else
+            # Calculate the first day of the previous month
+            first_day=$(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)
+            # Calculate the last day of the previous month
+            last_day=$(date -d "$first_day +1 month -1 day" +%Y-%m-%d)
+          fi
 
           #Set an environment variable with the date range
           echo "$first_day..$last_day"