Shrink emailservice base image, to python:3.12.7-alpine (#2813)

* Shrink emailservice base image, to python:3.13.0-alpine

* Update SHA256 hash

* Use AMD image instead of ARM

* Update commands in Dockerfile for alpine

* Downgrade to Python 3.12

I got the following error:
Building wheels for collected packages: google-cloud-profiler, grpcio, markupsafe
  Building wheel for google-cloud-profiler (pyproject.toml): started
  Building wheel for google-cloud-profiler (pyproject.toml): finished with status 'error'
  error: subprocess-exited-with-error
  
  × Building wheel for google-cloud-profiler (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [59 lines of output]
      running bdist_wheel

See https://github.com/GoogleCloudPlatform/microservices-demo/actions/runs/12034390461/job/33550847022?pr=2813.

This is because of an incompatibility between the google-cloud-profiler library and Python 3.13.

Author: NimJay

src/emailservice/Dockerfile

@@ -12,14 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM python:3.12.6-slim@sha256:ad48727987b259854d52241fac3bc633574364867b8e20aec305e6e7f4028b26 AS base
+FROM python:3.12.7-alpine@sha256:b83d5ec7274bee17d2f4bd0bfbb082f156241e4513f0a37c70500e1763b1d90d AS base
 
 FROM base AS builder
 
-RUN apt-get -qq update \
-    && apt-get install -y --no-install-recommends \
-        wget g++ \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk update \
+    && apk add --no-cache wget g++ \
+    && rm -rf /var/cache/apk/*
 
 # get packages
 COPY requirements.txt .