ci: Build test_app only on relevant changes

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,8 @@
-# Checklist for new Board Support package or Component
+# ESP-BSP Pull Request checklist
 
-- [ ] Component contains License
-- [ ] Component contains README.md
-- [ ] Project [README.md](../README.md) updated
-- [ ] Component contains idf_component.yml file with `url` field defined
-- [ ] Component was added to CI [upload job](https://github.com/espressif/esp-bsp/blob/master/.github/workflows/upload_component.yml#L17)
-- [ ] New files were added to CI build job
-- [ ] _Optional:_ Component contains unit tests
+> Note: For new BSPs create a PR with this [link](https://github.com/espressif/esp-bsp/compare/main...my-branch?quick_pull=1&template=pr_template_bsp.md).
+
+- [ ] Version of modified component bumped
 - [ ] CI passing
 
 # Change description

.github/PULL_REQUEST_TEMPLATE/pr_template_bsp.md

@@ -0,0 +1,14 @@
+# Checklist for new Board Support package or Component
+
+- [ ] Component contains License
+- [ ] Component contains README.md
+- [ ] Project [README.md](../README.md) updated
+- [ ] Component contains idf_component.yml file with `url` field defined
+- [ ] Component was added to CI [upload job](https://github.com/espressif/esp-bsp/blob/master/.github/workflows/upload_component.yml#L17)
+- [ ] New files were added to CI build job
+- [ ] New BSP definitions added to [build_example_for_all_bsps.sh](./build_example_for_all_bsps.sh) and to [bsp_ext.py](../examples/bsp_ext.py)
+- [ ] _Optional:_ Component contains unit tests
+- [ ] CI passing
+
+# Change description
+_Please describe your change here_

.github/workflows/build_test.yml

@@ -3,6 +3,10 @@ name: Build Test Application
 on:
   pull_request:
     types: [opened, reopened, synchronize]
+    paths:
+      - 'components/**'
+      - 'test_app/**'
+      - '.github/workflows/build_test.yml'
 
 jobs:
   build:
@@ -20,9 +24,9 @@ jobs:
       - name: Build ESP-BSP Test Application
         env:
           IDF_TARGET: ${{ matrix.idf_target }}
+        working-directory: test_app
         shell: bash
         run: |
-          cd test_app
           . ${IDF_PATH}/export.sh
           export PEDANTIC_FLAGS="-DIDF_CI_BUILD -Werror -Werror=deprecated-declarations -Werror=unused-variable -Werror=unused-but-set-variable -Werror=unused-function"
           export EXTRA_CFLAGS="${PEDANTIC_FLAGS} -Wstrict-prototypes"