Add Woodpecker CI pipeline with Gitea release upload

- ESP-IDF v5.3 Docker image for building
- Builds on push, PR, and tag events
- Uploads firmware binaries to Gitea releases on tags
- Includes bootloader, partition table, and ELF with debug symbols

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.woodpecker/build.yaml

@@ -1,8 +1,8 @@
 # ClearGrow Controller - ESP-IDF Build Pipeline
-# Triggers on push to any branch and pull requests
+# Triggers on push to any branch, pull requests, and tags
 
 when:
-  - event: [push, pull_request]
+  - event: [push, pull_request, tag]
 
 steps:
   - name: build
@@ -11,26 +11,58 @@ steps:
       - echo "=== ClearGrow Controller Build ==="
       - 'echo "Commit: ${CI_COMMIT_SHA}"'
       - 'echo "Branch: ${CI_COMMIT_BRANCH}"'
+      - 'echo "Tag: ${CI_COMMIT_TAG}"'
       - echo ""
+      # Source ESP-IDF environment
       - . /opt/esp/idf/export.sh
-      - 'echo "ESP-IDF version:"'
       - idf.py --version
       - echo ""
-      # Set target if not already set
-      - |
-        if [ ! -f build/CMakeCache.txt ] || ! grep -q "IDF_TARGET:STRING=esp32s3" build/CMakeCache.txt 2>/dev/null; then
-          echo "Setting target to ESP32-S3..."
-          idf.py set-target esp32s3
-        else
-          echo "Target already set to ESP32-S3"
-        fi
-      # Build with parallel jobs
-      - NPROC=$(nproc)
-      - 'echo "Starting build with $NPROC parallel jobs..."'
-      - idf.py build -- -j$NPROC
+      # Set target and build
+      - idf.py set-target esp32s3
+      - idf.py build
       - echo ""
       - echo "=== Build successful ==="
       - echo ""
       - 'echo "Binary sizes:"'
       - ls -lh build/*.bin 2>/dev/null || true
-      - ls -lh build/bootloader/*.bin 2>/dev/null || true
+      # Copy artifacts to release directory
+      - mkdir -p release
+      - cp build/cleargrow-controller.bin release/cleargrow-controller-${CI_COMMIT_TAG:-dev}.bin 2>/dev/null || true
+      - cp build/bootloader/bootloader.bin release/bootloader-${CI_COMMIT_TAG:-dev}.bin 2>/dev/null || true
+      - cp build/partition_table/partition-table.bin release/partition-table-${CI_COMMIT_TAG:-dev}.bin 2>/dev/null || true
+      - cp build/cleargrow-controller.elf release/cleargrow-controller-${CI_COMMIT_TAG:-dev}.elf 2>/dev/null || true
+
+  - name: release
+    image: quay.io/thegeeklab/wp-gitea-release
+    when:
+      - event: tag
+    settings:
+      base_url: https://git.cleargrow.io
+      api_key:
+        from_secret: gitea_release_token
+      files:
+        - release/*.bin
+        - release/*.elf
+      title: "Controller Firmware ${CI_COMMIT_TAG}"
+      note: |
+        ## ClearGrow Controller Firmware ${CI_COMMIT_TAG}
+
+        Firmware release for the ESP32-S3 touchscreen controller.
+
+        ### Files
+        - `cleargrow-controller-${CI_COMMIT_TAG}.bin` - Main application binary
+        - `bootloader-${CI_COMMIT_TAG}.bin` - Bootloader binary
+        - `partition-table-${CI_COMMIT_TAG}.bin` - Partition table
+        - `cleargrow-controller-${CI_COMMIT_TAG}.elf` - ELF with debug symbols
+
+        ### Flashing
+        ```bash
+        # Using esptool.py (flash all)
+        esptool.py --chip esp32s3 -b 460800 --before default_reset --after hard_reset write_flash \
+          0x0 bootloader-${CI_COMMIT_TAG}.bin \
+          0x8000 partition-table-${CI_COMMIT_TAG}.bin \
+          0x10000 cleargrow-controller-${CI_COMMIT_TAG}.bin
+
+        # Or using idf.py with the ELF
+        idf.py -p /dev/ttyUSB0 flash
+        ```