[stable/mongodb-replicaset] Make unguiculus/mongodb-install multiarch and include arm platforms (#22322) (#22323)

- also bumped mongodb-install image version number
- bumped chart version number
Signed-off-by: Kris Gandhi <git@krisg.co.uk>

Co-authored-by: Kris Gandhi <git@krisg.co.uk>
Co-authored-by: Reinhard Nägele <unguiculus@gmail.com>

stable/mongodb-replicaset/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: mongodb-replicaset
 home: https://github.com/mongodb/mongo
-version: 3.16.0
+version: 3.16.1
 appVersion: 3.6
 description: NoSQL document-oriented database that stores JSON-like documents with
   dynamic schemas, simplifying the integration of data in content-driven applications.

stable/mongodb-replicaset/install/Makefile

@@ -14,14 +14,12 @@
 
 all: push
 
-TAG = 0.7
+TAG = 0.8
 PREFIX = unguiculus/mongodb-install
+PLATFORM = linux/amd64,linux/arm/v7,linux/arm64/v8
 
 build:
-	docker build -t $(PREFIX):$(TAG) .
+	docker buildx build -t $(PREFIX):$(TAG) --platform $(PLATFORM) .
 
-push: build
-	docker push $(PREFIX):$(TAG)
-
-clean:
-	docker rmi $(PREFIX):$(TAG)
+push:
+	docker buildx build -t $(PREFIX):$(TAG) --platform $(PLATFORM) --push .