ci(flash_repo): Add build test

.github/workflows/build_test.yml

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+name: Build Custom Flash Driver Example
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout esp-flash-drivers repository
+      uses: actions/checkout@v3
+
+    - name: Checkout ESP-IDF repository
+      uses: actions/checkout@v3
+      with:
+        repository: espressif/esp-idf
+        path: esp-idf
+
+    - name: Set up esp-flash-drivers submodule
+      run: git submodule update --init --recursive
+
+    - name: Build custom_flash_driver example
+      run: |
+        cd esp-idf
+        ./install.sh
+        . ./export.sh
+        cd examples/storage/custom_flash_driver
+        idf.py set-target esp32
+        idf.py build

esp_flash_nor/CHANGELOG.md

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+
+
+## 0.0.4
+
+- Add CI test
+- Complete document
+
+## 0.0.3
+
+- Fix linker issue that make sure functions are put in RAM properly
+
+## 0.0.2
+
+- Fix the component url link
+
+## 0.0.1
+
+- Initial version for esp_flash_nor component