Updated replacement logic in release scripts

hack/changelog-template.txt

@@ -9,6 +9,6 @@ HELM CHART:
 * The version of the Helm chart is now %%HELM_CHART_VERSION%%.
 
 UPGRADE:
-* For NGINX, use the %%IC_VERSION%% image from our DockerHub: `nginx/nginx-ingress:%%IC_VERSION%%` or `nginx/nginx-ingress:%%IC_VERSION%%-alpine`
+* For NGINX, use the %%IC_VERSION%% image from our DockerHub: `nginx/nginx-ingress:%%IC_VERSION%%`, `nginx/nginx-ingress:%%IC_VERSION%%-alpine` or 'nginx/nginx-ingress:%%IC_VERSION%%-ubi
 * For NGINX Plus, please build your own image using the %%IC_VERSION%% source code.
 * For Helm, use version %%HELM_CHART_VERSION%% of the chart.

hack/prepare-minor-release.sh

@@ -36,8 +36,8 @@ fi
 ic_version=$1
 helm_chart_version=$2
 
-prev_ic_version=$(echo $ic_version | awk -F. '{ printf("%s.%s.%d", $1, $2, $3-1) }')
-prev_helm_chart_version=$(echo $helm_chart_version | awk -F. '{ printf("%s.%s.%d", $1, $2, $3-1) }')
+prev_ic_version=$(echo $ic_version | awk -F. '{ printf("%s\\.%s\\.%d", $1, $2, $3-1) }')
+prev_helm_chart_version=$(echo $helm_chart_version | awk -F. '{ printf("%s\\.%s\\.%d", $1, $2, $3-1) }')
 
 sed -i "" "s/$prev_ic_version/$ic_version/g" ${FILES_TO_UPDATE_IC_VERSION[*]}
 sed -i "" "s/$prev_helm_chart_version/$helm_chart_version/g" ${FILE_TO_UPDATE_HELM_CHART_VERSION[*]}
@@ -54,5 +54,11 @@ sed -i "" -e "s/%%TITLE%%/## NGINX Ingress Controller $ic_version/g" -e "s/%%IC_
 find $DOCS_TO_UPDATE_FOLDER -type f -name "*.md" -exec sed -i "" "s/v$prev_ic_version/v$ic_version/g" {} +
 find $DOCS_TO_UPDATE_FOLDER -type f -name "*.rst" -exec sed -i "" "s/v$prev_ic_version/v$ic_version/g" {} +
 
+# update IC version in the technical-specification doc
+sed -i "" "s/$prev_ic_version/$ic_version/g" $DOCS_TO_UPDATE_FOLDER/technical-specifications.md 
+
+# update IC version in the building ingress controller doc
+sed -i "" "s/$prev_ic_version/$ic_version/g" $DOCS_TO_UPDATE_FOLDER/installation/building-ingress-controller-image.md
+
 # update IC version in the helm doc  
 sed -i "" "s/$prev_ic_version/$ic_version/g" $DOCS_TO_UPDATE_FOLDER/installation/installation-with-helm.md