bump to latest rhel images, alpine 3.12 and go 1.13 (eclipse-che#27)

Change-Id: I9abbaf6fdb33b8280205c20a3bc90b79c6f7aeb5
Signed-off-by: nickboldt <[email protected]>

[base] Update from devtools/go-toolset-rhel7:1.12.12-3.1582636125 to devtools/go-toolset-rhel7:1.13.4-18

Change-Id: I1d9764282c8b5afa791990f4b7b8d3b9a63b5931
Signed-off-by: nickboldt <[email protected]>

[base] Update from rhel8/go-toolset:1.12.8-45 to rhel8/go-toolset:1.13.4-15

Change-Id: I549131e409ac9093875dc6fd47af665057ed5cc5
Signed-off-by: nickboldt <[email protected]>

[base] Update from ubi8-minimal:8.1-409 to ubi8-minimal:8.2-267

Change-Id: I95e960d60889b905ce7b16506a9b98e795d1d890
Signed-off-by: nickboldt <[email protected]>

Author: nickboldt

build/dockerfiles/Dockerfile

@@ -10,14 +10,14 @@
 #   Red Hat, Inc. - initial API and implementation
 #
 
-FROM golang:1.12-alpine3.9 as builder
+FROM golang:1.13-alpine3.12 as builder
 RUN apk add --no-cache ca-certificates
 RUN adduser -D -g '' appuser
 WORKDIR /go/src/github.com/eclipse/che-jwtproxy/
 COPY . /go/src/github.com/eclipse/che-jwtproxy/
 RUN CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-w -s' -a -installsuffix cgo -o jwtproxy cmd/jwtproxy/main.go
 
-FROM alpine:3.9
+FROM alpine:3.12
 USER appuser
 COPY --from=builder /etc/passwd /etc/passwd
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/

build/dockerfiles/rhel.Dockerfile

@@ -12,7 +12,7 @@
 # UPSTREAM: use devtools/go/-toolset-rhel7 image so we're not required to authenticate with registry.redhat.io
 # https://access.redhat.com/containers/?tab=tags#/registry.access.redhat.com/devtools/go-toolset-rhel7
 FROM registry.access.redhat.com/devtools/go-toolset-rhel7:1.13.4-18 as builder
-ENV PATH=/opt/rh/go-toolset-1.12/root/usr/bin:$PATH
+ENV PATH=/opt/rh/go-toolset-1.13/root/usr/bin:$PATH
 # DOWNSTREAM: use rhel8/go-toolset; no path modification needed
 # https://access.redhat.com/containers/?tab=tags#/registry.access.redhat.com/rhel8/go-toolset
 # FROM registry.redhat.io/rhel8/go-toolset:1.13.4-15 as builder