ci: build release test image with no cache

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

.github/workflows/release-tag.yml

@@ -18,7 +18,7 @@ jobs:
           echo "AUTHENTIK_SECRET_KEY=$(openssl rand 32 | base64 -w 0)" >> .env
           docker buildx install
           mkdir -p ./gen-ts-api
-          docker build -t testing:latest .
+          docker build --no-cache -t testing:latest .
           echo "AUTHENTIK_IMAGE=testing" >> .env
           echo "AUTHENTIK_TAG=latest" >> .env
           docker compose up --no-start