Use 11g server's v14 timezone file via ORA_TZFILE

Approach:
- Oracle 11g XE uses timezone v14; Instant Client 21.15 uses v35
- 11g's DBMS_DST doesn't support upgrading to v35 (GET_LATEST_TIMEZONE_VERSION
  was added in 12c), so we cannot upgrade the server
- Instead, extract v14 files from the 11g container and point the client
  at them via ORA_TZFILE — client stays at 21.15, just uses v14 tz data
- Use bare filename (not absolute path) for ORA_TZFILE since the file
  lives in oracore/zoneinfo/ under the Instant Client directory

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

Author: yahonda

.github/workflows/test_11g.yml

@@ -73,6 +73,19 @@ jobs:
     - name: Install JDBC Driver
       run: |
         wget -q https://download.oracle.com/otn-pub/otn_software/jdbc/233/ojdbc11.jar -O ./lib/ojdbc11.jar
+    - name: Configure ORA_TZFILE to match Oracle 11g server
+      run: |
+        # Oracle 11g XE uses timezone file v14; Instant Client 21.15 embeds v35.
+        # This mismatch causes ORA-01805 when ruby-oci8 fetches DATE/TIMESTAMP
+        # values. Copy the v14 files from the 11g container and point the
+        # Instant Client at them via ORA_TZFILE.
+        ORACLE_CONTAINER=$(docker ps --filter "ancestor=gvenzl/oracle-xe:11" -q)
+        sudo mkdir -p /opt/oracle/instantclient_21_15/oracore/zoneinfo
+        docker cp "$ORACLE_CONTAINER":/u01/app/oracle/product/11.2.0/xe/oracore/zoneinfo/timezlrg_14.dat /tmp/timezlrg_14.dat
+        docker cp "$ORACLE_CONTAINER":/u01/app/oracle/product/11.2.0/xe/oracore/zoneinfo/timezone_14.dat /tmp/timezone_14.dat
+        sudo mv /tmp/timezlrg_14.dat /opt/oracle/instantclient_21_15/oracore/zoneinfo/
+        sudo mv /tmp/timezone_14.dat /opt/oracle/instantclient_21_15/oracore/zoneinfo/
+        echo "ORA_TZFILE=timezlrg_14.dat" >> $GITHUB_ENV
     - name: Create database user
       run: |
         ./ci/setup_accounts.sh