Add CI workflow for Oracle Database 11g

Uses gvenzl/oracle-xe:11 container with Oracle Instant Client 21.15
(the latest client that supports Oracle 11g).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

.github/workflows/test_11g.yml

@@ -0,0 +1,89 @@
+name: test_11g
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    strategy:
+      matrix:
+        ruby: [
+          '4.0',
+          '3.4',
+          '3.3',
+          '3.2',
+          '3.1',
+          '3.0',
+          '2.7',
+          '2.6',
+          '2.5',
+          ruby-head,
+          ruby-debug,
+          truffleruby,
+          truffleruby-head
+        ]
+    env:
+      ORACLE_HOME: /opt/oracle/instantclient_21_15
+      LD_LIBRARY_PATH: /opt/oracle/instantclient_21_15
+      NLS_LANG: AMERICAN_AMERICA.AL32UTF8
+      TNS_ADMIN: ./ci/network/admin
+      DATABASE_NAME: XE
+      TZ: Europe/Riga
+      DATABASE_SYS_PASSWORD: Oracle18
+      DATABASE_VERSION: 11.2.0.2
+
+    services:
+      oracle:
+        image: gvenzl/oracle-xe:11
+        ports:
+          - 1521:1521
+        env:
+          TZ: Europe/Riga
+          ORACLE_PASSWORD: Oracle18
+        options: >-
+          --health-cmd healthcheck.sh
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 10
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - name: Create symbolic link for libaio library compatibility
+      run: |
+        sudo ln -s /usr/lib/x86_64-linux-gnu/libaio.so.1t64 /usr/lib/x86_64-linux-gnu/libaio.so.1
+    - name: Download Oracle instant client
+      run: |
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2115000/instantclient-basic-linux.x64-21.15.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2115000/instantclient-sqlplus-linux.x64-21.15.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2115000/instantclient-sdk-linux.x64-21.15.0.0.0dbru.zip
+    - name: Install Oracle instant client
+      run: |
+        sudo mkdir -p /opt/oracle/
+        sudo unzip instantclient-basic-linux.x64-21.15.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -o instantclient-sqlplus-linux.x64-21.15.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -o instantclient-sdk-linux.x64-21.15.0.0.0dbru.zip -d /opt/oracle
+        echo "/opt/oracle/instantclient_21_15" >> $GITHUB_PATH
+    - name: Install JDBC Driver
+      run: |
+        wget -q https://download.oracle.com/otn-pub/otn_software/jdbc/233/ojdbc11.jar -O ./lib/ojdbc11.jar
+    - name: Create database user
+      run: |
+        ./ci/setup_accounts.sh
+    - name: Disable ActiveRecord for TruffleRuby
+      run: |
+        echo "NO_ACTIVERECORD=true" >> $GITHUB_ENV
+      if: "contains(matrix.ruby, 'truffleruby')"
+    - name: Bundle install
+      run: |
+        bundle install --jobs 4 --retry 3
+    - name: Run RSpec
+      run: |
+        bundle exec rspec