Removed pg14, Added pg17, bump alpine, move to matrix

Dockerfile.pg17

@@ -0,0 +1,20 @@
+FROM alpine:3.21
+
+ENV APP_HOME=/home/app/docker-postgres-backup \
+    PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PIP_BREAK_SYSTEM_PACKAGES=1 \
+    PIP_NO_CACHE_DIR=off \
+    PIP_DISABLE_PIP_VERSION_CHECK=on \
+    LANG=en_US.UTF-8
+
+RUN apk --no-cache add postgresql17-client python3 py3-pip tini
+
+COPY ./ $APP_HOME
+WORKDIR $APP_HOME
+
+RUN python3 -m pip install $APP_HOME
+
+ENTRYPOINT ["tini", "--"]
+
+CMD ["python3", "start.py"]