Github: Create Labeler workflow/action and labels.yml file

.github/labels.yml

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+# Add 'source' label to any change to src files within the source dir EXCEPT for the docs sub-folder
+# source:
+# - any: ['src/**/*', '!src/docs/*']
+
+
+🛤️ Path:
+- 'src/Mod/Path/**/*'
+
+🏛 Arch:
+- 'src/Mod/Arch/**/*'
+
+AddonManager:
+- 'src/Mod/AddonManager/**/*'
+
+🚜 PartDesign:
+- 'src/Mod/PartDesign/**/*'
+
+':pencil2: Sketcher':
+- 'src/Mod/Sketcher/**/*'
+
+📐 Draft:
+- 'src/Mod/Draft/**/*'
+
+🧪 FEM:
+- 'src/Mod/Fem/**/*'
+
+⚙ TechDraw:
+- 'src/Mod/TechDraw/**/*'
+
+🧱 Part:  
+- 'src/Mod/Part/**/*'
+
+🥅Mesh:
+- 'src/Mod/Mesh/**/*'
+
+Spreadsheet:
+- 'src/Mod/Spreadsheet/**/*'
+
+Core:
+- 'src/App/**/*'
+- 'src/Base/**/*'
+- 'src/Gui/**/*'

.github/workflows/labeler.yml

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+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# For more information, see:
+# https://github.com/actions/labeler
+
+name: Labeler
+on:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+    - uses: actions/labeler@v3
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        configuration-path: ".github/labels.yml"
+        sync-labels: false