feat: Provide workflow to automatically add all issues to GitHub Project (#445)

Signed-off-by: Tom Kerkhove <kerkhove.tom@gmail.com>

.github/workflows/auto-add-issues-to-project.yml

@@ -0,0 +1,46 @@
+name: Automatically add new issue to backlog
+on:
+  issues:
+    types:
+      - opened
+jobs:
+  track_issue:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get project data
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_PROJECT_AUTOMATION_AUTH }}
+          ORGANIZATION: kedacore
+          # This refers to our backlog project: https://github.com/orgs/kedacore/projects/6/views/1
+          PROJECT_NUMBER: 6
+        run: |
+          gh api graphql -f query='
+            query($org: String!, $number: Int!) {
+              organization(login: $org){
+                projectNext(number: $number) {
+                  id
+                  fields(first:20) {
+                    nodes {
+                      id
+                      name
+                      settings
+                    }
+                  }
+                }
+              }
+            }' -f org=$ORGANIZATION -F number=$PROJECT_NUMBER > project_data.json
+
+          echo 'PROJECT_ID='$(jq '.data.organization.projectNext.id' project_data.json) >> $GITHUB_ENV
+      - name: Add issue to project
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_PROJECT_AUTOMATION_AUTH }}
+          ISSUE_ID: ${{ github.event.issue.node_id }}
+        run: |
+          item_id="$( gh api graphql -f query='
+            mutation($project:ID!, $issue:ID!) {
+              addProjectNextItem(input: {projectId: $project, contentId: $issue}) {
+                projectNextItem {
+                  id
+                }
+              }
+            }' -f project=$PROJECT_ID -f issue=$ISSUE_ID --jq '.data.addProjectNextItem.projectNextItem.id')"