Fix Error, empty output for info: 'VERSION'

When building releases, the definitive canonical version of podman (or
podman-remote) is needed.  Previously this was accomplished by scraping
`version/version.go`.  However, due to tooling differences across
platforms, this has proven problematic, unreliable, and hard to
maintain.

Fix this by building and caching a small golang binary who's only purpose
is to print the version number to stdout.  This not only provides a quick
and reliable way to determine the current version, it also acts as a check
on the version API vs tooling that relies on it.

Lastly, remove several `RELEASE_*` Makefile definitions which aren't
actually used anywhere.  These were originally added a very long time
ago to serve as part of a long since retired release process.  The
remaining items, were updated to make use of the new `.podmanversion`
binary on an as-required basis (i.e. not every time `make` is run).

Signed-off-by: Chris Evich <cevich@redhat.com>

hack/get_release_info.sh

@@ -1,70 +0,0 @@
-#!/usr/bin/env bash
-
-# This script produces various bits of metadata needed by Makefile.  Using
-# a script allows uniform behavior across multiple environments and
-# distributions.  The script expects a single argument, as reflected below.
-
-set -euo pipefail
-
-cd "${GOSRC:-$(dirname $0)/../}"
-
-valid_args() {
-    REGEX='^\s+[[:upper:]]+\*[)]'
-    egrep --text --no-filename --group-separator=' ' --only-matching "$REGEX" "$0" | \
-        cut -d '*' -f 1
-}
-
-# `git describe` will never produce a useful version number under all
-# branches.  This is because the podman release process (see `RELEASE_PROCESS.md`)
-# tags release versions only on release-branches (i.e. never on main).
-# Scraping the version number directly from the source, is the only way
-# to reliably obtain the number from all the various contexts supported by
-# the `Makefile`.
-scrape_version() {
-    local v
-    # extract the value of 'var Version'
-    v=$(sed -ne 's/^var\s\+Version\s\+=\s.*("\(.*\)").*/\1/p' <version/version.go)
-    # If it's empty, something has changed in version.go, that would be bad!
-    test -n "$v"
-    # Value consumed literally, must not have any embedded newlines
-    echo -n "$v"
-}
-
-unset OUTPUT
-case "$1" in
-    # Wild-card suffix needed by valid_args() e.g. possible bad grep of "$(echo $FOO)"
-    VERSION*)
-        OUTPUT="${CIRRUS_TAG:-$(scrape_version)}"
-        ;;
-    NUMBER*)
-        OUTPUT="$($0 VERSION | sed 's/-.*//')"
-        ;;
-    DIST_VER*)
-        OUTPUT="$(source /etc/os-release; echo $VERSION_ID | cut -d '.' -f 1)"
-        ;;
-    DIST*)
-        OUTPUT="$(source /etc/os-release; echo $ID)"
-        ;;
-    ARCH*)
-        OUTPUT="${GOARCH:-$(go env GOARCH 2> /dev/null)}"
-        ;;
-    BASENAME*)
-        OUTPUT="podman"
-        ;;
-    REMOTENAME*)
-        OUTPUT="$($0 BASENAME)-remote"
-        ;;
-    *)
-        echo "Error, unknown/unsupported argument '$1', valid arguments:"
-        valid_args
-        exit 1
-        ;;
-esac
-
-if [[ -n "$OUTPUT" ]]
-then
-    echo -n "$OUTPUT"
-else
-    echo "Error, empty output for info: '$1'" > /dev/stderr
-    exit 2
-fi