revert dockerfile changes done in #309 (#315)

Signed-off-by: Mohamed Mahmoud <mmahmoud@redhat.com>

Dockerfile

@@ -2,29 +2,15 @@
 ARG TARGETPLATFORM=linux/amd64
 ARG BUILDPLATFORM=linux/amd64
 ARG TARGETARCH=amd64
-ARG GOVERSION="1.21.7"
 
-# Build layer
-FROM --platform=$TARGETPLATFORM fedora:39 as builder
+# Build the manager binary
+FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.21 as builder
+
+
 ARG TARGETARCH
 ARG TARGETPLATFORM
-ARG GOVERSION
 ARG VERSION="unknown"
 
-RUN dnf install -y git go kernel-devel make llvm clang unzip
-RUN dnf clean all
-
-WORKDIR /
-
-RUN curl -qL https://go.dev/dl/go$GOVERSION.linux-$TARGETARCH.tar.gz -o go.tar.gz
-RUN tar -xzf go.tar.gz
-RUN rm go.tar.gz
-
-ENV GOROOT /go
-RUN mkdir -p /gopath
-ENV GOPATH /gopath
-ENV PATH $GOROOT/bin:$GOPATH/bin:$PATH
-
 WORKDIR /opt/app-root
 
 # Copy the go manifests and source
@@ -39,7 +25,6 @@ COPY Makefile Makefile
 COPY .mk/ .mk/
 
 # Build
-RUN make gen-bpf
 RUN GOARCH=$TARGETARCH make compile
 
 # Create final image from minimal + built binary