Add issue template to collect billing data for a specific time period

.github/ISSUE_TEMPLATE/08_collect-billing-data.yaml

@@ -0,0 +1,38 @@
+name: "💳 Collect billing data for a time period"
+description: "Generate the billing data for a specific time period for all 2i2c clusters"
+title: "[Billing] Collect billing data for {{ Month(s) }} - {{ Dedicated / Shared }} clusters"
+labels: ["billing"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        This template is designed to help the engineers plan the recurrent task of generating and collecting in one place the billing data either for shared or for dedicated 2i2c clusters for a specific time interval.
+
+        Once all the info has been filled in, this issue is considered to be fully refined and can be added to the `Refined` column of the Project Board.
+
+        # Context
+
+  - type: dropdown
+    id: cluster_type
+    attributes:
+      label: Instructions for performing this task
+      options:
+        - Dedicated clusters [instructions](https://infrastructure.2i2c.org/howto/bill/#communities-with-dedicated-cloud-accounts)
+        - Shared clusters [instructions](https://infrastructure.2i2c.org/howto/bill/#communities-in-shared-cloud-accounts)
+    validations:
+      required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        # Definition of Done
+
+  - type: checkboxes
+    attributes:
+      label: Tasklist
+      description: Once these are done, the issue can be considered complete and can be closed.
+      options:
+        - label: Billing data is collected according to instructions.
+          required: false
+        - label: The billing slack was notified about the new billing data collected
+          required: false