Chore: Move from master to main branch (#33693)

* Chore: Move from master branch to main

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* CI: Upgrade build pipeline tool to v2

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

scripts/build/ci-msi-build/Dockerfile

@@ -2,7 +2,7 @@ FROM grafana/wix-toolset-ci:v3
 
 RUN mkdir -p /tmp/dist /tmp/cache && \
     cd /tmp/dist && \
-    wget https://dl.grafana.com/enterprise/master/grafana-enterprise-6.6.0-ca61af52pre.windows-amd64.zip && \
+    wget https://dl.grafana.com/enterprise/main/grafana-enterprise-6.6.0-ca61af52pre.windows-amd64.zip && \
     unzip -l *.zip
 
 COPY . /package-grafana

scripts/build/release_publisher/main.go

@@ -71,7 +71,7 @@ func main() {
 func createBaseURL(root string, bucketName string, product string, nightly bool) string {
 	var subPath string
 	if nightly {
-		subPath = "master"
+		subPath = "main"
 	} else {
 		subPath = "release"
 	}