R echo client tests (#17629)

* add r echo api client sample

* add r workflow

* fix

* add env

* set r version

* install curl

* install dep

* fix

* comment out installation

.github/workflows/samples-r.yaml

@@ -0,0 +1,42 @@
+name: Samples R
+
+on:
+  push:
+    paths:
+      - 'samples/client/echo_api/r/**'
+  pull_request:
+    paths:
+      - 'samples/client/echo_api/r/**'
+
+jobs:
+  build:
+    name: Build R
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sample:
+          - 'samples/client/echo_api/r/'
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node.js
+        uses: actions/setup-node@v4
+      - name: Run echo server
+        run: |
+          git clone https://github.com/wing328/http-echo-server -b openapi-generator-test-server
+          (cd http-echo-server && npm install && npm start &)
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: 3.6.1
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        working-directory: ${{ matrix.sample }}
+        with:
+          cache-version: 2
+      - name: Install curl
+        run: sudo apt-get install -y r-cran-curl
+      - name: build and test
+        working-directory: ${{ matrix.sample }}
+        run: |
+          # export _R_CHECK_FORCE_SUGGESTS_=false
+          /bin/bash build_and_test.bash
+        shell: bash