add setup-oss (#14)

* Create action.yml

* Create README.md

* Update README.md

actions/setup-oss/README.md

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+# Setup OSS Environment
+
+This action installs ossutil and configures the OSS environment for further operations.
+
+## Inputs
+
+### `oss-id`
+
+**Required** OSS access key ID.
+
+### `oss-secret`
+
+**Required** OSS access key secret.
+
+### `oss-endpoint`
+
+**Required** OSS endpoint.
+
+## Example usage
+
+```yaml
+uses: vesoft-inc/.github/actions/setup-oss@master
+with:
+  oss-id: ${{ secrets.OSS_ID }}
+  oss-secret: ${{ secrets.OSS_SECRET }}
+  oss-endpoint: ${{ secrets.OSS_ENDPOINT }}

actions/setup-oss/action.yml

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+name: 'Setup OSS Environment'
+description: 'Install ossutil and configure OSS credentials'
+inputs:
+  oss-id:
+    description: 'OSS access key ID'
+    required: true
+  oss-secret:
+    description: 'OSS access key secret'
+    required: true
+  oss-endpoint:
+    description: 'OSS endpoint'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install ossutil
+      run: |
+        if ! command -v ossutil &> /dev/null || ! command -v ossutil64 &> /dev/null
+        then
+          (command -v sudo &> /dev/null && curl https://gosspublic.alicdn.com/ossutil/install.sh | sudo bash) || curl https://gosspublic.alicdn.com/ossutil/install.sh | bash
+        fi
+      shell: bash
+
+    - name: Configure OSS
+      run: |
+        ossutil64 config -e ${{ inputs.oss-endpoint }} -i ${{ inputs.oss-id }} -k ${{ inputs.oss-secret }} -L CH
+      shell: bash