Prow jobs respect default entrypoints

Supercedes kubernetes#25383, where in kubernetes#25383 the logic is in the pod where tests run, the problem there is that imagePullSecret defined on job pod is not accessible, which limits it's use case. The other problem is that the containers inside a test pod are not aware of the image they are from, so it's a little bit weird to let them know about it.

This PR moves the logic to plank, which feels more natural

-----------------------------
This is an unfortunate fact of prow, that user need to explictly set the entrypoint.

The migration of prow images from being built with bazel to ko introduced a side effect of all prow jobs that use gcr.io/k8s-prow images, such as robots/comment, robots/pr-creator etc. would fail due to the location of default entrypoint change. It would be trivial amount of work to update the binary location in prow jobs definition, but would like to use this opportunity to try to get this fixed.

(This PR was an effort baked on top of separate offline brainstorming with @cjwagner and @BenTheElder )
(The entrypoint extraction and docker auth parts were mainly from @imjasonh's work at ko-build/ko#581)

go.mod

@@ -20,14 +20,19 @@ replace (
 
 	golang.org/x/lint => golang.org/x/lint v0.0.0-20190409202823-959b441ac422
 	gopkg.in/yaml.v3 => gopkg.in/yaml.v3 v3.0.0-20190709130402-674ba3eaed22
-	k8s.io/client-go => k8s.io/client-go v0.22.2
+	k8s.io/client-go => k8s.io/client-go v0.23.4
 )
 
 require (
-	cloud.google.com/go v0.81.0
-	cloud.google.com/go/pubsub v1.4.0
+	cloud.google.com/go/cloudbuild v1.2.0
+	cloud.google.com/go/container v1.2.0 // indirect
+	cloud.google.com/go/kms v1.4.0 // indirect
+	cloud.google.com/go/monitoring v1.4.0 // indirect
+	cloud.google.com/go/pubsub v1.5.0
+	cloud.google.com/go/secretmanager v1.3.0
 	cloud.google.com/go/storage v1.12.0
-	github.com/Azure/azure-sdk-for-go v42.3.0+incompatible
+	cloud.google.com/go/trace v1.2.0 // indirect
+	github.com/Azure/azure-sdk-for-go v46.4.0+incompatible
 	github.com/Azure/azure-storage-blob-go v0.8.0
 	github.com/Azure/go-autorest/autorest v0.11.18
 	github.com/Azure/go-autorest/autorest/adal v0.9.13
@@ -36,78 +41,82 @@ require (
 	github.com/andygrunwald/go-gerrit v0.0.0-20210709065208-9d38b0be0268
 	github.com/andygrunwald/go-jira v1.14.0
 	github.com/aws/aws-sdk-go v1.37.22
+	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20220228164355-396b2034c795
 	github.com/bazelbuild/buildtools v0.0.0-20200922170545-10384511ce98
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/bwmarrin/snowflake v0.0.0
+	github.com/chrismellard/docker-credential-acr-env v0.0.0-20220119192733-fe33c00cee21
 	github.com/clarketm/json v1.13.4
 	github.com/client9/misspell v0.3.4
 	github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 // indirect
 	github.com/denormal/go-gitignore v0.0.0-20180930084346-ae8ad1d07817
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
 	github.com/djherbis/atime v1.0.0
-	github.com/evanphx/json-patch v4.11.0+incompatible
+	github.com/evanphx/json-patch v4.12.0+incompatible
 	github.com/felixge/fgprof v0.9.1
-	github.com/fsnotify/fsnotify v1.4.9
+	github.com/fsnotify/fsnotify v1.5.1
 	github.com/fsouza/fake-gcs-server v1.19.4
 	github.com/go-bindata/go-bindata/v3 v3.1.3
 	github.com/go-openapi/spec v0.19.6
 	github.com/go-test/deep v1.0.7
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/golang/glog v1.0.0
 	github.com/gomodule/redigo v1.8.5
-	github.com/google/go-cmp v0.5.6
+	github.com/google/go-cmp v0.5.7
+	github.com/google/go-containerregistry v0.8.1-0.20220209165246-a44adc326839
+	github.com/google/go-containerregistry/pkg/authn/kubernetes v0.0.0-20220310143843-f1fa40b162a1
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/gofuzz v1.2.1-0.20210504230335-f78f29fc09ea
-	github.com/google/uuid v1.2.0
+	github.com/google/uuid v1.3.0
 	github.com/gorilla/csrf v1.6.2
-	github.com/gorilla/mux v1.7.4
+	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/securecookie v1.1.1
 	github.com/gorilla/sessions v1.2.0
-	github.com/gregjones/httpcache v0.0.0-20190212212710-3befbb6ad0cc
+	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79
 	github.com/hashicorp/go-retryablehttp v0.6.6
 	github.com/hashicorp/golang-lru v0.5.4
 	github.com/klauspost/pgzip v1.2.1
 	github.com/mattn/go-zglob v0.0.2
-	github.com/pelletier/go-toml v1.9.3
+	github.com/pelletier/go-toml v1.9.4
 	github.com/peterbourgon/diskv v2.0.1+incompatible
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.11.0
 	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.26.0
+	github.com/prometheus/common v0.28.0
 	github.com/satori/go.uuid v1.2.0
 	github.com/shurcooL/githubv4 v0.0.0-20210725200734-83ba7b4c9228
 	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/cobra v1.2.1
+	github.com/spf13/cobra v1.3.0
 	github.com/spf13/pflag v1.0.5
 	github.com/tektoncd/pipeline v0.14.1-0.20200710073957-5eeb17f81999
-	go.uber.org/zap v1.19.0
+	go.uber.org/zap v1.19.1
 	go4.org v0.0.0-20201209231011-d4a079459e60
 	gocloud.dev v0.19.0
-	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616
-	golang.org/x/net v0.0.0-20210520170846-37e1c6afe023
-	golang.org/x/oauth2 v0.0.0-20210402161424-2e8d93401602
+	golang.org/x/net v0.0.0-20220225172249-27dd8689420f
+	golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
-	golang.org/x/tools v0.1.5
-	google.golang.org/api v0.44.0
-	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c
-	google.golang.org/protobuf v1.26.0
+	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65
+	golang.org/x/tools v0.1.8
+	google.golang.org/api v0.70.0
+	google.golang.org/genproto v0.0.0-20220222213610-43724f9ea8cf
+	google.golang.org/protobuf v1.27.1
 	gopkg.in/fsnotify.v1 v1.4.7
-	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/ini.v1 v1.66.2
 	gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
-	k8s.io/api v0.22.2
-	k8s.io/apimachinery v0.22.2
+	k8s.io/api v0.23.4
+	k8s.io/apimachinery v0.23.4
 	k8s.io/client-go v11.0.1-0.20190805182717-6502b5e7b1b5+incompatible
-	k8s.io/code-generator v0.22.2
+	k8s.io/code-generator v0.23.0
 	k8s.io/klog v1.0.0
-	k8s.io/utils v0.0.0-20210819203725-bdf08cb9a70a
+	k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9
 	knative.dev/pkg v0.0.0-20200711004937-22502028e31a
 	mvdan.cc/xurls/v2 v2.0.0
 	sigs.k8s.io/boskos v0.0.0-20210730172138-093b54882439
-	sigs.k8s.io/controller-runtime v0.10.3
+	sigs.k8s.io/controller-runtime v0.11.1
 	sigs.k8s.io/controller-tools v0.6.3-0.20210827222652-7b3a8699fa04
-	sigs.k8s.io/yaml v1.2.0
+	sigs.k8s.io/yaml v1.3.0
 )
 
 go 1.16