diff --git a/.circleci/config.yml b/.circleci/config.yml
index 13e8269..0c151e1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,7 +1,11 @@
-version: '2'
+version: '2.1'
 
 jobs:
   build:
+    parameters:
+      rolling:
+        type: string
+        default: "no"
     machine:
       image: ubuntu-2004:202010-01
       docker_layer_caching: true
@@ -10,9 +14,6 @@ jobs:
       BUILDKIT_PROGRESS: plain
     steps:
       - checkout
-      - run:
-          name: Setup Environment
-          command: source setup_env.sh
       - run:
           name: Install Python dependencies
           command: python3 -m pip install packaging
@@ -21,7 +22,7 @@ jobs:
             - python-deps-cache-v1
       - run:
           name: Building Container Images
-          command: ./build.sh
+          command: ./build.sh << parameters.rolling >>
       - save_cache:
           key: python-deps-cache-v1
           paths:
@@ -48,6 +49,7 @@ workflows:
   build-and-deploy-workflow:
     jobs:
       - build:
+          rolling: "no"
           filters:
             tags:
               only: /^v\d+\.\d+\.\d+$/
@@ -61,11 +63,13 @@ workflows:
               only: main
     jobs:
       - build:
+          rolling: "yes"
           context: org-global
 
   rolling-workflow:
     jobs:
       - build:
+          rolling: "yes"
           context: org-global
           filters:
             branches:
diff --git a/build.sh b/build.sh
index 55e6413..7c3c14a 100755
--- a/build.sh
+++ b/build.sh
@@ -2,16 +2,13 @@
 
 set -ex
 
+# Set the default value of BUILD_ROLLING to no.
+export BUILD_ROLLING="${1:-no}"
+
 DOCKER=docker
 
-# Set the env variable to later test this release before it is deployed.
-if [ "$1" = "dev" ]; then
-    export DEV=true
-fi
-
-REG_URL=${REGISTRY}_URL
-
-if [ "$EVENT_TYPE" = "cron" ]  || [ "$DEV" = "true" ]; then
+if [ "$BUILD_ROLLING" = "yes" ]; then
+    echo "Building rolling releases..."
     python3 -m venv venv
     source venv/bin/activate
     pip install python-gitlab
@@ -46,6 +43,7 @@ if [ "$EVENT_TYPE" = "cron" ]  || [ "$DEV" = "true" ]; then
             --build-arg DJ_MM3_REF=$DJ_MM3_REF \
             -t maxking/mailman-web:rolling web/
 
+    # build the postorius image.
     $DOCKER build -f postorius/Dockerfile.dev\
 			--label version.git_commit="$COMMIT_ID"\
             --label version.postorius="$POSTORIUS_REF" \
@@ -56,7 +54,8 @@ if [ "$EVENT_TYPE" = "cron" ]  || [ "$DEV" = "true" ]; then
             --build-arg DJ_MM3_REF=$DJ_MM3_REF \
 			-t maxking/postorius:rolling postorius/
 else
-    # Do the normal building process.
+    echo "Building stable releases..."
+    # Build the stable releases.
     $DOCKER build -t maxking/mailman-core:rolling core/
     $DOCKER build -t maxking/mailman-web:rolling web/
     $DOCKER build -t maxking/postorius:rolling postorius/
diff --git a/deploy.py b/deploy.py
index 069f282..ae50d6c 100644
--- a/deploy.py
+++ b/deploy.py
@@ -34,6 +34,7 @@ USER = 'maxking'
 TAG_VAR = 'CIRCLE_TAG'
 BRANCH_VAR = 'CIRCLE_BRANCH'
 PRIMARY_BRANCH = 'main'
+ROLLING_VAR = "BUILD_ROLLING"
 
 
 def tag(original, final):
@@ -112,8 +113,7 @@ def main():
         if img_tag.startswith('v'):
             img_tag = img_tag[1:]
             is_release = True
-
-    elif os.environ.get(BRANCH_VAR) == PRIMARY_BRANCH:
+    elif os.environ.get(BRANCH_VAR) == PRIMARY_BRANCH and os.environ.get(ROLLING_VAR) == "yes":
         img_tag = 'rolling'
     else:
         print('Not running on {PRIMARY_BRANCH} branch or Git tag so not publishing...'.format(
diff --git a/setup_env.sh b/setup_env.sh
deleted file mode 100644
index 51dc93a..0000000
--- a/setup_env.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-# Script to setup environment variables.
-
-set -ex
-
-set_var () {
-	echo $1=$2 >> $BASH_ENV
-	export $1=$2
-}
-
-setup_env () {
-	CI_NAME=$1
-	# Set the current branch name.
-	BRANCH_NAME=${CI_NAME}_BRANCH
-    set_var BRANCH ${!BRANCH_NAME}
-}
-
-
-if [ "$TRAVIS" ]; then
-	# Set environments picked up from Circle CI.
-	set_var EVENT_TYPE "$TRAVIS_EVENT_TYPE"
-	set_var COMMIT_ID $TRAVIS_COMMIT
-	# Setup some generic environment vars.
-	setup_env TRAVIS
-elif [ "$CIRCLECI" ]; then
-	# Set environments picked up from Circle CI.
-	set_var EVENT_TYPE "push"
-	set_var COMMIT_ID $CIRCLE_SHA1
-	# Setup some generic environment vars.
-	setup_env CIRCLE
-fi
-
-if [ "$BRANCH" = "master" ]; then
-	set_var TAG "latest"
-else
-	set_var TAG "$COMMIT_ID"
-fi
-
-set_var REG_URL ${REGISTRY}_URL
diff --git a/tests/generate_tests.sh b/tests/generate_tests.sh
index f62a5d9..dbc6cb6 100644
--- a/tests/generate_tests.sh
+++ b/tests/generate_tests.sh
@@ -1,13 +1,5 @@
 #!/bin/sh
 
-
-if [ "$EVENT_TYPE" = "cron" ] || [ ! -z $DEV ] ; then
-		echo "Event type is: $EVENT_TYPE"
-		echo "This is a development version build: $DEV"
-		TAG="rolling"
-fi
-
-
 cat > docker-test.yaml <<EOF
 version: '2'