build_deploy: fix docker build CLI syntax

[vrutkovs]

docker build needs -f <dockerfile path> <directory> args

Fixes stage build:

+ DOCKERFILE_DEPLOY=/var/lib/jenkins/workspace/openshift-cincinnati-gh-build-master/dist/Dockerfile.deploy/Dockerfile
+ docker build -t quay.io/app-sre/cincinnati:024bf30 /var/lib/jenkins/workspace/openshift-cincinnati-gh-build-master/dist/Dockerfile.deploy/Dockerfile
unable to prepare context: context must be a directory: /var/lib/jenkins/workspace/openshift-cincinnati-gh-build-master/dist/Dockerfile.deploy/Dockerfile
Build step 'Execute shell' marked build as failure

[wking]

Looks like we dropped -f in 071c112 (#24). What changed to make it required again?

[wking]

Ahh, de5b199 (#222) shifted this from a $RELEASE_OUTPUT_DIR directory to a $DOCKERFILE_DEPLOY Dockerfile.

/lgtm

[vrutkovs]

In #24 the script was reworked to create a temp dir and copying binaries produced by cargo build --release there. In multistage build its no longer required, so the context is set to the whole dir and it requires the path to dockerfile

[openshift-ci-robot]

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[openshift-ci-robot]

@vrutkovs: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e	c9591cc	link	/test e2e

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