Updated dapper files

Migrated to SUSE containers, a newer version of Go, and using golangci-lint for all linting.

Dockerfile.dapper

@@ -1,20 +1,13 @@
-FROM golang:1.13.4-alpine3.10
+FROM registry.suse.com/bci/golang:1.17
 
 ARG DAPPER_HOST_ARCH
 ENV ARCH $DAPPER_HOST_ARCH
-
-RUN apk -U add bash git gcc musl-dev docker vim less file curl wget ca-certificates
-RUN go get -d golang.org/x/lint/golint && \
-    git -C /go/src/golang.org/x/lint/golint checkout -b current 06c8688daad7faa9da5a0c2f163a3d14aac986ca && \
-    go install golang.org/x/lint/golint && \
-    rm -rf /go/src /go/pkg
-RUN mkdir -p /go/src/golang.org/x && \
-    cd /go/src/golang.org/x && git clone https://github.com/golang/tools && \
-    git -C /go/src/golang.org/x/tools checkout -b current aa82965741a9fecd12b026fbb3d3c6ed3231b8f8 && \
-    go install golang.org/x/tools/cmd/goimports
+ARG CACHEBUST=1
+RUN zypper -n up && \
+    zypper -n in git docker vim curl wget
 RUN rm -rf /go/src /go/pkg
 RUN if [ "${ARCH}" == "amd64" ]; then \
-        curl -sL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.15.0; \
+        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.46.2; \
     fi
 
 ENV GO111MODULE off

scripts/validate

@@ -5,16 +5,10 @@ cd $(dirname $0)/..
 
 echo Running validation
 
-PACKAGES="$(find -name '*.go' | xargs -I{} dirname {} |  cut -f2 -d/ | sort -u | grep -Ev '(^\.$|.git|.trash-cache|vendor|bin)' | sed -e 's!^!./!' -e 's!$!/...!')"
+if ! command -v golangci-lint; then
+    echo Skipping validation: no golangci-lint available
+    exit
+fi
 
-echo Running: go vet
-go vet ${PACKAGES}
-echo Running: golint
-for i in ${PACKAGES}; do
-    if [ -n "$(golint $i | grep -v 'should have comment.*or be unexported' | tee /dev/stderr)" ]; then
-        failed=true
-    fi
-done
-test -z "$failed"
-echo Running: go fmt
-test -z "$(go fmt ${PACKAGES} | tee /dev/stderr)"
+echo Running: golangci-lint
+golangci-lint run