Use multiarch echo image for e2e tests

[code-elinka]

To run some of the e2e tests we need an echo
image, therefore we want both of them be
multiarch.
NB! The Windows image doesn't support multiarch.

[code-elinka]

/cc @mmamczur
/assign @cezarygerard
/assign @gauravkghildiyal
/meow

[k8s-ci-robot]

@code-elinka:

In response to this:

/cc @mmamczur
/assign @cezarygerard
/assign @gauravkghildiyal
/meow

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In response to this:

/cc @mmamczur
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/assign @gauravkghildiyal
/meow

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In response to this:

/cc @mmamczur
/assign @cezarygerard
/assign @gauravkghildiyal
/meow

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[gauravkghildiyal]

LGTM

[cezarygerard]

/lgtm

[k8s-ci-robot]

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