feat(docker/kumactl): make entrypoint consistent

UPGRADE.md

@@ -14,6 +14,23 @@ does not have any particular instructions.
 
 * Changed path match `type` from `Prefix` to `PathPrefix`
 
+#### `kumactl` container image
+
+* Changed image's entrypoint to `/usr/bin/kumactl`
+
+This change was introduced to be consistent with `kuma-cp` and `kuma-dp` images,
+where names of images refer to binaries set in entrypoint. 
+
+Example valid before:
+```sh
+docker run kumahq/kumactl:2.2.1 kumactl install transparent-proxy --help
+```
+
+Equivalent example valid now:
+```sh
+docker run kumahq/kumactl:2.3.0 install transparent-proxy --help
+```
+
 ## Upgrade to `2.2.x`
 
 ### Universal

deployments/charts/kuma/templates/pre-upgrade-install-crds-job.yaml

@@ -84,7 +84,7 @@ data:
     fi
   save_crds.sh: |
     set -e
-    
+
     crds="$(kumactl install crds --no-config {{ if .Values.experimental.gatewayAPI }}--experimental-gatewayapi{{end}})"
 
     if [ -n "${crds}" ]; then
@@ -133,8 +133,7 @@ spec:
              limits:
                cpu: "100m"
                memory: "256Mi"
-          command:
-            - '/kuma/scripts/install_crds.sh'
+          command: ["/kuma/scripts/install_crds.sh"]
           volumeMounts:
             - mountPath: /kuma/crds
               name: crds
@@ -160,8 +159,8 @@ spec:
           - mountPath: /kuma/scripts
             name: scripts
             readOnly: true
-          args:
-          - '/kuma/scripts/save_crds.sh'
+          command: ["sh", "-c"]
+          args: ["/kuma/scripts/save_crds.sh"]
       volumes:
         - name: scripts
           configMap:

tools/releases/dockerfiles/kumactl.Dockerfile

@@ -6,4 +6,4 @@ ARG ARCH
 COPY /tools/releases/templates/NOTICE-kumactl /kuma/NOTICE
 COPY /build/artifacts-linux-$ARCH/kumactl/kumactl /usr/bin/
 
-ENTRYPOINT ["/busybox/busybox", "sh", "-c"]
+ENTRYPOINT ["/usr/bin/kumactl"]