Split up actions (#129)

* Refactor conditional dependent jobs into separate actions
* Fix incorrect usage of pull_request_target
* Fix Dependabot not merging due to labels being absent when issue is created
* Prettify supported version listing

.github/workflows/draft_release.yml

@@ -0,0 +1,44 @@
+name: Draft Github Release
+
+on:
+  workflow_run:
+    workflows: [ "OpenInv CI" ]
+    types: [ completed ]
+
+jobs:
+  draft_release:
+    if: "github.event.workflow_run.event == 'push'
+      && github.event.workflow_run.conclusion == 'success'
+      && startsWith(github.event.workflow_run.event.push.ref, 'refs/tags/')"
+    runs-on: ubuntu-latest
+    steps:
+      # Fetch all history - used to assemble changelog.
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set Release Variables
+        run: bash ./scripts/set_release_env.sh
+
+      - name: Download Artifact
+        # Unfortunately actions/download-artifact cannot fetch from other workflow runs.
+        uses: dawidd6/action-download-artifact@v2.26.0
+        with:
+          name: dist
+          path: dist
+          run_id: "${{ github.event.workflow_run.id }}"
+          run_number: "${{ github.event.workflow_run.run_number }}"
+          # Searching for a specific run ID that we know was successful, unset 'success' default.
+          workflow_conclusion: ""
+
+      - name: Create Release
+        id: create-release
+        uses: softprops/action-gh-release@v0.1.15
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          name: ${{ env.VERSIONED_NAME }}
+          body: ${{ env.GENERATED_CHANGELOG }}
+          draft: true
+          prerelease: false
+          files: ./dist/OpenInv.jar