feat(amazonq): support Dockerfile files in /dev (#5131)

Add `Dockerfile`, `Dockerfile.build` and `*.dockerfile` to list of supported file extensions for /dev

Author: michaellandi

.changes/next-release/feature-06ad3a97-c95c-40f5-8c7b-bc2e262f6e06.json

@@ -0,0 +1,4 @@
+{
+  "type" : "feature",
+  "description" : "Amazon Q /dev: support `Dockerfile` files"
+}

plugins/core/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/FeatureDevSessionContext.kt

@@ -68,6 +68,12 @@ class FeatureDevSessionContext(val project: Project, val maxProjectSizeBytes: Lo
         "dist/?"
     ).map { Regex(it) }
 
+    // well known source files that do not have extensions
+    private val wellKnownSourceFiles = setOf(
+        "Dockerfile",
+        "Dockerfile.build"
+    )
+
     // projectRoot: is the directory where the project is located when selected to open a project.
     val projectRoot = project.guessProjectDir() ?: error("Cannot guess base directory for project ${project.name}")
 
@@ -117,6 +123,8 @@ class FeatureDevSessionContext(val project: Project, val maxProjectSizeBytes: Lo
         return deferredResults.any { it.await() }
     }
 
+    private fun wellKnown(file: VirtualFile): Boolean = wellKnownSourceFiles.contains(file.name)
+
     suspend fun zipFiles(projectRoot: VirtualFile): File = withContext(getCoroutineBgContext()) {
         val files = mutableListOf<VirtualFile>()
         val ignoredExtensionMap = mutableMapOf<String, Long>().withDefault { 0L }
@@ -126,8 +134,9 @@ class FeatureDevSessionContext(val project: Project, val maxProjectSizeBytes: Lo
             projectRoot,
             object : VirtualFileVisitor<Unit>() {
                 override fun visitFile(file: VirtualFile): Boolean {
+                    val isWellKnown = runBlocking { wellKnown(file) }
                     val isFileIgnoredByExtension = runBlocking { ignoreFileByExtension(file) }
-                    if (isFileIgnoredByExtension) {
+                    if (!isWellKnown && isFileIgnoredByExtension) {
                         val extension = file.extension.orEmpty()
                         ignoredExtensionMap[extension] = (ignoredExtensionMap[extension] ?: 0) + 1
                         return false

plugins/core/jetbrains-community/src/software/aws/toolkits/jetbrains/services/telemetry/TelemetryUtils.kt

@@ -40,6 +40,7 @@ val ALLOWED_CODE_EXTENSIONS = setOf(
     "d",
     "dart",
     "dfm",
+    "dockerfile",
     "dpr",
     "e",
     "el",