Fix v2 config parser dropping profiles from earlier config files (25.10.x)

modules/nextflow/src/main/groovy/nextflow/config/parser/v2/ConfigParserV2.groovy

@@ -48,7 +48,7 @@ class ConfigParserV2 implements ConfigParser {
 
     private List<String> appliedProfiles
 
-    private Set<String> declaredProfiles
+    private Set<String> declaredProfiles = new HashSet<>()
 
     private Map<String,Object> declaredParams
 
@@ -133,7 +133,7 @@ class ConfigParserV2 implements ConfigParser {
             script.run()
 
             final target = script.getTarget()
-            declaredProfiles = script.getDeclaredProfiles()
+            declaredProfiles.addAll(script.getDeclaredProfiles())
             declaredParams = script.getDeclaredParams()
             return Bolts.toConfigObject(target)
         }

modules/nextflow/src/test/groovy/nextflow/config/parser/v2/ConfigParserV2Test.groovy

@@ -375,6 +375,36 @@ class ConfigParserV2Test extends Specification {
         slurper.getDeclaredProfiles() == ['alpha','beta'] as Set
     }
 
+    def 'should accumulate declared profiles across multiple config files' () {
+        // a single parser instance is reused to parse all config files (see ConfigBuilder),
+        // so the set of declared profiles must accumulate rather than be overwritten by the
+        // last file parsed -- otherwise profiles defined in an earlier file are reported as
+        // "Unknown configuration profile" when a later file declares none
+        given:
+        def withProfiles = '''
+            profiles {
+                alpha {
+                    a = 1
+                }
+                beta {
+                    b = 2
+                }
+            }
+            '''
+        def withoutProfiles = '''
+            tower {
+                enabled = true
+            }
+            '''
+
+        when:
+        def slurper = new ConfigParserV2().setProfiles(['alpha'])
+        slurper.parse(withProfiles)
+        slurper.parse(withoutProfiles)
+        then:
+        slurper.getDeclaredProfiles() == ['alpha','beta'] as Set
+    }
+
     def 'should return the map of declared params' () {
 
         given: