[Snyk] Security upgrade alpine from latest to 3.15

[snyk-bot]

trafficstars

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile

We recommend upgrading to alpine:3.15, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Issue	Exploit Maturity
	CVE-2022-0778 SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit
	CVE-2022-0778 SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit

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[piersy]

Coverage from tests in ./e2e_test/... for ./consensus/istanbul/... at commit f574894d4579275ad885aff92e96cb33d38bb317

coverage: 51.7% of statements across all listed packages

coverage:  64.9% of statements in consensus/istanbul
coverage:  43.1% of statements in consensus/istanbul/announce
coverage:  56.0% of statements in consensus/istanbul/backend
coverage:   0.0% of statements in consensus/istanbul/backend/backendtest
coverage:  24.3% of statements in consensus/istanbul/backend/internal/replica
coverage:  70.3% of statements in consensus/istanbul/core
coverage:  50.0% of statements in consensus/istanbul/db
coverage:   0.0% of statements in consensus/istanbul/proxy
coverage:  75.3% of statements in consensus/istanbul/uptime
coverage: 100.0% of statements in consensus/istanbul/uptime/store
coverage:  51.8% of statements in consensus/istanbul/validator
coverage:  79.2% of statements in consensus/istanbul/validator/random

CommentID: 4e515de774

[palango]

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