Add GitHub Action to update aws-sdk-rust/next branch (#1774)

Author: jdisanti

.github/workflows/update-sdk-next.yml

@@ -0,0 +1,55 @@
+# This workflow updates the `next` branch with freshly generated
+# code from the latest smithy-rs and models that reside in aws-sdk-rust.
+name: Update `aws-sdk-rust/next`
+on:
+  workflow_dispatch:
+
+jobs:
+  update-next:
+    name: Update `next`
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out `smithy-rs`
+      uses: actions/checkout@v3
+      with:
+        repository: awslabs/smithy-rs
+        ref: main
+        path: smithy-rs
+    - name: Check out `aws-sdk-rust`
+      uses: actions/checkout@v3
+      with:
+        repository: awslabs/aws-sdk-rust
+        ref: main
+        path: aws-sdk-rust
+        token: ${{ secrets.RELEASE_AUTOMATION_BOT_PAT }}
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: 11
+      # Rust is only used to `rustfmt` the generated code; doesn't need to match MSRV
+    - name: Set up Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+    - name: Delete old SDK
+      run: |
+    - name: Generate a fresh SDK
+      run: |
+        WORKSPACE="$(pwd)"
+        cd smithy-rs
+        ./gradlew aws:sdk:assemble --info -Paws.sdk.models.path="${WORKSPACE}/aws-sdk-rust/aws-models"
+    - name: Update `aws-sdk-rust/next`
+      run: |
+        set -eux
+        cd aws-sdk-rust
+        git checkout origin/main -b next
+
+        # Delete the old SDK
+        rm -rf sdk examples
+        rm -f versions.toml Cargo.toml index.md
+
+        # Copy in the new SDK
+        mv ../smithy-rs/aws/sdk/build/aws-sdk/* .
+        git add .
+        git -c 'user.name=AWS SDK Rust Bot' -c '[email protected]' commit -m 'Update `aws-sdk-rust/next`' --allow-empty
+        git push origin next:next --force