readiness probe 추가 및 워크플로 보강

- ReadinessController로 DB 연결 여부 확인 엔드포인트 추가
- CI 워크플로에 readiness probe 검증 로직 추가 (120초 제한)
- develop, stage 브랜치 push 이벤트 트리거 추가

src/main/java/com/eactive/apim/portal/apps/ReadinessController.java

@@ -0,0 +1,67 @@
+package com.eactive.apim.portal.apps;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * Readiness probe.
+ *
+ * <p>Distinct from {@link HealthCheckController} (liveness — servlet alive?).
+ * This endpoint validates both EMS and Gateway datasources via JDBC
+ * {@code Connection.isValid(timeout)} to confirm the app is ready to serve
+ * requests that depend on the database.
+ *
+ * <p>HTTP 200 + JSON when all checks pass.
+ * <p>HTTP 503 + JSON when any check fails — body still includes the per-component
+ * status so CI/CD logs the failing dependency.
+ */
+@RestController
+public class ReadinessController {
+
+    private static final int VALIDATION_TIMEOUT_SECONDS = 2;
+
+    private final DataSource portalDataSource;
+    private final DataSource gatewayDataSource;
+
+    public ReadinessController(
+            @Qualifier("portalDataSource") DataSource portalDataSource,
+            @Qualifier("gatewayDataSource") DataSource gatewayDataSource) {
+        this.portalDataSource = portalDataSource;
+        this.gatewayDataSource = gatewayDataSource;
+    }
+
+    @GetMapping(value = "/health/ready", produces = MediaType.APPLICATION_JSON_VALUE)
+    public ResponseEntity<String> ready() {
+        String ems = check(portalDataSource);
+        String gw  = check(gatewayDataSource);
+        boolean ok = "UP".equals(ems) && "UP".equals(gw);
+
+        String body = "{"
+                + "\"status\":\"" + (ok ? "UP" : "DOWN") + "\","
+                + "\"ems\":\""    + ems + "\","
+                + "\"gateway\":\""+ gw  + "\""
+                + "}";
+
+        return ResponseEntity.status(ok ? 200 : 503)
+                .contentType(MediaType.APPLICATION_JSON)
+                .body(body);
+    }
+
+    private static String check(DataSource ds) {
+        if (ds == null) return "DOWN:NO_DATASOURCE";
+        try (Connection c = ds.getConnection()) {
+            return c.isValid(VALIDATION_TIMEOUT_SECONDS) ? "UP" : "DOWN:INVALID";
+        } catch (SQLException e) {
+            String msg = e.getMessage() == null ? "" : e.getMessage();
+            return "DOWN:" + msg.replace('"', '\'').replace('\n', ' ').replace('\r', ' ');
+        }
+    }
+}