[release-3.3] fix Dockerfile wildcard character error

[besscroft]

test environment：
OS: Debian GNU/Linux 10 (buster) aarch64
Host: KVM Virtual Machine virt-4.2
Kernel: 4.19.0-20-arm64

if [[ $(arch) == "aarch64*" ]]; then ARCH=arm64; fi -> failed
if [[ $(arch) == "aarch64"* ]]; then ARCH=arm64; fi -> success
if [[ $(arch) == aarch64* ]]; then ARCH=arm64; fi -> success

I tried testing inside a Docker container and on the host machine, "aarch64*" -> failed.

This results in the inability to download the correct package in the arm64 environment.

[besscroft]

2 suggestions:

1. remove wildcards.
2. Translate to alternative arch names used in multiarch images.

Example:

if [ $(arch) == "amd64"   ]; then ARCH=amd64; fi
if [ $(arch) == "i386"    ]; then ARCH=i386; fi
if [ $(arch) == "aarch64" ]; then ARCH=arm64; fi

Can consider which way is more suitable, I can make corresponding adjustments and re-issue the PR.

[pixiake]

@besscroft Thanks for this contribution. I think this pr can be adopted at present.

[pixiake]

/lgtm
/approve

[ks-ci-bot]

LGTM label has been added.

Git tree hash: 38e7f5f2dfc4ad8c48d278135cd356d7547d7e57

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: besscroft, pixiake

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[pixiake]

/cherrypick master

[ks-ci-bot]

@pixiake: new pull request created: #1982

In response to this:

/cherrypick master

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