[CI:DOCS]Initial PR validation

This PR is only a first step towards being able to validate developer
code locally prior to pushing a PR and using CI.  Right now, we have a
prepared image in a temporary spot (will change when done).  That image
can be used to exercise various podman builds, make validate, and DCO
check.

The idea here is we have a make target that spins a podman container (or
machine) and then execute a small script to perform the actual builds.
Note, these builds are to verify code, not make production binaries so
corners are cut.  As of now, we choose to not build cross-arch binaries
because most of our problems thus far have been operating system builds
and not arch.

Of course this can be expanded in the future.  This is just step one to
start getting some of it in place.  The rest of the work is tracked in
JIRA under two cards.

Signed-off-by: Brent Baude <bbaude@redhat.com>

Makefile

@@ -315,6 +315,18 @@ codespell:
 .PHONY: validate
 validate: lint .gitvalidation validate.completions man-page-check swagger-check tests-expect-exit pr-removes-fixed-skips
 
+.PHONY: validatepr
+validatepr:
+	$(PODMANCMD) run --rm --env HOME=/root \
+		-v $(CURDIR):/var/tmp/go/src/github.com/containers/podman \
+		--security-opt label=disable \
+		quay.io/libpod/fedora_podman:latest  \
+		make .validatepr
+
+.PHONY: .validatepr
+.validatepr:
+	env BUILDTAGS="$(BUILDTAGS)" REMOTETAGS="$(REMOTETAGS)" contrib/validatepr/validatepr.sh
+
 .PHONY: build-all-new-commits
 build-all-new-commits:
 	# Validate that all the commits build on top of $(GIT_BASE_BRANCH)

contrib/validatepr/Containerfile

@@ -0,0 +1,17 @@
+FROM registry.fedoraproject.org/fedora:latest
+
+WORKDIR /go/src/github.com/containers/podman
+
+RUN dnf install -y systemd-devel \
+	libassuan-devel \
+	libseccomp-devel \
+	gpgme-devel \
+	device-mapper-devel \
+	btrfs-progs-devel \
+	golang \
+	make \
+	man-db \
+	git \
+	perl-Clone \
+	perl-FindBin \
+	pre-commit  && dnf clean all

contrib/validatepr/validatepr.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -x
+
+#
+# This script is intended to help developers contribute to the podman project. It
+# checks various pre-CI checks like building, linting, man-pages, etc.  It is meant
+# to be run in a specific container environment.
+#
+
+# build all require incantations of podman
+echo "Building windows ..."
+GOOS=windows CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/test.windows ./cmd/podman
+echo "Building darwin..."
+GOOS=darwin CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/test.darwin ./cmd/podman
+
+# build podman
+echo "Building podman binaries ..."
+make binaries
+
+
+echo "Running validation tooling ..."
+make validate