RELEASE.md: add docs about releasing from a branch

Signed-off-by: Cristian Staretu <[email protected]>

RELEASE.md

@@ -2,7 +2,17 @@
 TBD
 
 # Manual releases
-1. Set BUILD_VERSION, e.g., 1.0.0-beta.3. Set or update the following variables under script/build.sh. Merge via PR to appropriate branch.
+1. Check out the right branch and the right commit. This is necessary
+when not releasing from the HEAD of master.
+
+2. Tag the right commit and push it to GitHub. This is mandatory if the
+release isn't made from the HEAD of master.
+	```
+	git tag 1.0.1 3aba546aea1235
+	git push origin 1.0.1
+	```
+
+3. Set BUILD_VERSION, e.g., 1.0.0-beta.3. Set or update the following variables under script/build.sh. Merge via PR to appropriate branch.
 
 	```
 	auth_proxy_version=${CONTIV_API_PROXY_VERSION:-"1.0.0-beta.3"}
@@ -12,21 +22,21 @@ TBD
 	docker_version=${CONTIV_DOCKER_VERSION:-1.12.6}
 	```
 
-2. Build docker binary image. This would create a docker image contiv/install:$BUILD_VERSION. It also creates two release bundles - contiv-${BUILD_VETSION}.tgz and contiv-full-${BUILD_VERSION}.tgz. This version should be tested locally using a vagrant setup with release-test-* make targets.
+4. Build docker binary image. This would create a docker image contiv/install:$BUILD_VERSION. It also creates two release bundles - contiv-${BUILD_VETSION}.tgz and contiv-full-${BUILD_VERSION}.tgz. This version should be tested locally using a vagrant setup with release-test-* make targets.
 
 	```
-	make build
+	make ansible-image
 	```
 
-2. Execute ```./scripts/release.sh``` Creates a new release on GitHub.
+5. Execute ```./scripts/release.sh``` Creates a new release on GitHub.
 
 	```
 	export GITHUB_USER=contiv
         export GITHUB_TOKEN=<your token here>
         ./scripts/release.sh
         ```
 
-3. Push image to docker hub
+6. Push image to docker hub
 
 	```
 	docker login -u $docker_user -p $docker_password