Remove explicit references to Docker buildx

Buildkit and buildx are used by default by the builder since Docker
Engine 23.0, so we don't need to explicitly use the buildx command.

Signed-off-by: Rajath Agasthya <[email protected]>

Author: rajathagasthya

.github/workflows/ci.yaml

@@ -195,8 +195,6 @@ jobs:
           fi
           echo "PUSH_ON_BUILD=${GENERATE_ARTIFACTS}" >> $GITHUB_ENV
           echo "DOCKER_BUILD_PLATFORM_OPTIONS=--platform=linux/arm64" >> $GITHUB_ENV
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -243,8 +241,6 @@ jobs:
           fi
           echo "PUSH_ON_BUILD=${GENERATE_ARTIFACTS}" >> $GITHUB_ENV
           echo "DOCKER_BUILD_PLATFORM_OPTIONS=--platform=linux/amd64" >> $GITHUB_ENV
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:

Makefile

@@ -16,10 +16,6 @@ BUILD_MULTI_ARCH_IMAGES ?= false
 DOCKER ?= docker
 GO_CMD ?= go
 PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
-BUILDX  =
-ifeq ($(BUILD_MULTI_ARCH_IMAGES),true)
-BUILDX = buildx
-endif
 
 ##### Global variables #####
 include $(CURDIR)/versions.mk
@@ -284,8 +280,7 @@ ALL_TARGETS := $(PUSH_TARGETS) $(BUILD_TARGETS) $(TEST_TARGETS) docker-image
 build-%: DOCKERFILE = $(CURDIR)/docker/Dockerfile
 
 build-image:
-	DOCKER_BUILDKIT=1 \
-		$(DOCKER) $(BUILDX) build --pull \
+		$(DOCKER) build --pull \
 		$(DOCKER_BUILD_OPTIONS) \
 		$(DOCKER_BUILD_PLATFORM_OPTIONS) \
 		--tag $(IMAGE) \