spec: Substitute git revision when generating

When doing a build from the spec file, 'git rev-parse HEAD' is unlikely
to correspond to a hash from github.com/code-ready/crc.
It will most likely be a hash from dist-git, or from a git repository
created at build time by `%autosetup -S git`
This commit allows to use 'make COMMIT_SHA=xxxx' to override the one used at
build time, to ensure the sha we use in release-info.json or in "crc
version" is something useful.

Makefile

@@ -8,7 +8,7 @@ OKD_VERSION ?= 4.12.0-0.okd-2023-02-18-033438
 MICROSHIFT_VERSION ?= 4.12.5
 BUNDLE_EXTENSION = crcbundle
 CRC_VERSION = 2.15.0
-COMMIT_SHA=$(shell git rev-parse --short HEAD)
+COMMIT_SHA?=$(shell git rev-parse --short HEAD)
 MACOS_INSTALL_PATH = /usr/local/crc
 CONTAINER_RUNTIME ?= podman
 
@@ -359,6 +359,7 @@ $(BUILD_DIR)/macos-universal/crc-macos-installer.tar: packagedir
 					   -e '/__BUNDLED_PROVIDES__/d' \
 					   -e 's/__VERSION__/'$(CRC_VERSION)'/g' \
 					   -e 's/__OPENSHIFT_VERSION__/'$(OPENSHIFT_VERSION)'/g' \
+					   -e 's/__COMMIT_SHA__/'$(COMMIT_SHA)'/g' \
 				       $< >$@
 
 %: %.in

packaging/rpm/crc.spec.in

@@ -60,7 +60,7 @@ export GOFLAGS="-mod=vendor"
 mkdir embed-files
 cp /usr/bin/crc-driver-libvirt embed-files
 cp /usr/bin/crc-admin-helper embed-files/crc-admin-helper-linux
-make GO_EXTRA_LDFLAGS="-B 0x$(head -c20 /dev/urandom|od -An -tx1|tr -d ' \n')" GO_EXTRA_BUILDFLAGS="" CUSTOM_EMBED=true EMBED_DOWNLOAD_DIR=embed-files/ release
+make COMMIT_SHA=__COMMIT_SHA__ GO_EXTRA_LDFLAGS="-B 0x$(head -c20 /dev/urandom|od -An -tx1|tr -d ' \n')" GO_EXTRA_BUILDFLAGS="" CUSTOM_EMBED=true EMBED_DOWNLOAD_DIR=embed-files/ release
 
 %install
 # with fedora macros: gopkginstall