Merge pull request #811 from Tecnativa/fix-psql12-repo

[FIX] Changed the PostgreSQL 12 repository.

Author: pedrobaeza

Dockerfile

@@ -123,7 +123,7 @@ RUN set -eux; \
     apk fetch --no-cache --repositories-file psql_repos postgresql-client -o "$APK_POSTGRES_DIR/10"; \
     echo "http://dl-cdn.alpinelinux.org/alpine/v3.10/main" > psql_repos; \
     apk fetch --no-cache --repositories-file psql_repos postgresql-client -o "$APK_POSTGRES_DIR/11"; \
-    echo "http://dl-cdn.alpinelinux.org/alpine/v3.14/main" > psql_repos; \
+    echo "http://dl-cdn.alpinelinux.org/alpine/v3.12/main" > psql_repos; \
     apk fetch --no-cache --repositories-file psql_repos postgresql-client -o "$APK_POSTGRES_DIR/12"; \
     apk fetch --no-cache postgresql13-client -o "$APK_POSTGRES_DIR/13"; \
     apk fetch --no-cache postgresql14-client -o "$APK_POSTGRES_DIR/14"; \