Bump Dockerfile version to 1.7 (#1916)

build/Dockerfile

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6
+# syntax=docker/dockerfile:1.7
 FROM golang:1.22 as builder
 
 WORKDIR /go/src/github.com/nginxinc/nginx-gateway-fabric

build/Dockerfile.nginx

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6
+# syntax=docker/dockerfile:1.7
 FROM nginx:1.25.5-alpine-otel
 
 ARG NJS_DIR

build/Dockerfile.nginxplus

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6
+# syntax=docker/dockerfile:1.7
 FROM scratch as nginx-files
 
 # the following links can be replaced with local files if needed, i.e. ADD --chown=101:1001 <local_file> <container_file>

conformance/tests/Dockerfile

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6
+# syntax=docker/dockerfile:1.7
 # this is here so we can grab the latest version of kind and have dependabot keep it up to date
 FROM kindest/node:v1.29.2
 

debug/Dockerfile

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6
+# syntax=docker/dockerfile:1.7
 # This Dockerfile builds an image with the dlv debugger. See the debugging guide in the developer docs for details
 # on how to use it.
 FROM golang:1.21-alpine AS builder