chore(docker): Standardize FROM syntax in Dockerfile

[VaiTon]

What

• Uniform casing for dockerfile keywords
• Otherwise, docker complains

 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 8)                                                                            0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29)                                                                           0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 40)                                                                           0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 8)                                                                            0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29)                                                                           0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 40)                                                                           0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 74)                                                                           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 74)                                                                           0.0s
 => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 86)