ci(labeler): auto-apply Port labels from changed driver files (#3673)

* ci(labeler): auto-apply Port labels from changed driver files

Add path-based labeling so a PR touching a dcd/hcd driver under
src/portable/ gets the matching "Port <ip>" label automatically.

.github/labeler.yml

@@ -0,0 +1,77 @@
+# Path-based auto-labeling for USB IP / port drivers.
+# Maps changed dcd/hcd files under src/portable/ to their "Port <ip>" label.
+# Consumed by actions/labeler (see .github/workflows/labeler.yml -> label-port job).
+
+"Port DWC2":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/synopsys/dwc2/**'
+
+"Port EHCI":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/ehci/**'
+
+"Port OHCI":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/ohci/**'
+
+"Port FSDev":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/st/stm32_fsdev/**'
+
+"Port ChipIdea":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/chipidea/**'
+
+"Port NXP IP3511":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/nxp/lpc_ip3511/**'
+
+"Port NXP IP3516":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/nxp/lpc_ip3516/**'
+
+"Port MUSB":
+  - changed-files:
+      - any-glob-to-any-file:
+          - 'src/portable/mentor/musb/**'
+          - 'src/portable/sunxi/**'
+
+"Port RUSB2":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/renesas/rusb2/**'
+
+"Port WCH USBFS":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/wch/*usbfs*'
+
+"Port WCH USBHS":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/wch/*usbhs*'
+
+"Port MAX3421":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/analog/max3421/**'
+
+"Port SAMD":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/microchip/samd/**'
+
+"Port SAMG":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/microchip/samg/**'
+
+"Port nRF":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/nordic/nrf5x/**'
+
+"Port Nuvoton":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/nuvoton/**'
+
+"Port RP2":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/raspberrypi/**'
+
+"Port MSP430":
+  - changed-files:
+      - any-glob-to-any-file: 'src/portable/ti/msp430x5xx/**'

.github/workflows/labeler.yml

@@ -4,12 +4,14 @@ on:
   issues:
     types: [opened]
   pull_request_target:
-    types: [opened]
+    types: [opened, synchronize, reopened]
   discussion:
     types: [created]
 
 jobs:
   label-priority:
+    # Author-based priority labels: only on issue/PR/discussion creation, not on PR updates.
+    if: github.event_name != 'pull_request_target' || github.event.action == 'opened'
     runs-on: ubuntu-latest
     permissions:
       issues: write
@@ -160,3 +162,21 @@ jobs:
                 });
               }
             }
+
+  # Path-based Port labels: attach "Port <ip>" when a PR touches the matching
+  # dcd/hcd driver under src/portable/. Mapping lives in .github/labeler.yml.
+  label-port:
+    if: github.event_name == 'pull_request_target'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write # allow auto-creating a Port label that doesn't exist yet
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          configuration-path: .github/labeler.yml
+          # sync-labels so a Port label is removed once a PR no longer touches
+          # that driver (job reruns on synchronize). Only labels listed in
+          # labeler.yml are managed, so author-based Prio/Sponsor labels are untouched.
+          sync-labels: true