fix(ci): Fix Dockerfile casing warnings

[rolodato]

Fixes these warnings when running any docker build command:

 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 57)                  0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 58)                  0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 76)                  0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 81)                  0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 86)                  0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 118)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 143)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 162)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 172)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 183)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 200)                 0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 231)                 0.0s

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jan 21, 2025 9:21pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jan 21, 2025 9:21pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jan 21, 2025 9:21pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5031	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5031	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5031	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5031	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5031	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5031	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-60129 was deleted.