Reduce docker warnings

Signed-off-by: Derek Nola <derek.nola@suse.com>

Dockerfile.dapper

@@ -1,7 +1,7 @@
 FROM golang:1.22-alpine3.21
 
 ARG DAPPER_HOST_ARCH
-ENV ARCH $DAPPER_HOST_ARCH
+ENV ARCH=$DAPPER_HOST_ARCH
 
 RUN apk -U add bash git gcc musl-dev docker vim less file curl wget ca-certificates
 RUN GOPROXY=direct go install golang.org/x/tools/cmd/goimports@gopls/v0.16.2
@@ -12,10 +12,10 @@ RUN if [ "${ARCH}" == "amd64" ]; then \
     fi
 
 ENV DAPPER_ENV REPO TAG DRONE_TAG
-ENV DAPPER_SOURCE /go/src/github.com/k3s-io/helm-controller/
+ENV DAPPER_SOURCE=/go/src/github.com/k3s-io/helm-controller/
 ENV DAPPER_OUTPUT ./bin ./dist
-ENV DAPPER_DOCKER_SOCKET true
-ENV HOME ${DAPPER_SOURCE}
+ENV DAPPER_DOCKER_SOCKET=true
+ENV HOME=${DAPPER_SOURCE}
 WORKDIR ${DAPPER_SOURCE}
 
 ENTRYPOINT ["./scripts/entry"]