Update postgres references (#774)

* Update postgres references

Update postgres-12.x references to simply 12.

No tags exist for this image other than a very old one.

* Pinned postgres image version with SHA

* Pinned postgres image

* Pinned postgres image version

Author: david-sandy

docker-compose/db-only-migrate.docker-compose.yaml

@@ -12,7 +12,7 @@ services:
   #
   pgsql:
     container_name: pgsql
-    image: 'index.docker.io/sourcegraph/postgres-12.6-alpine:insiders@sha256:5a6badacb3cf2a2bfc039f68746e0d849e95ded1976bf3ef18471008069c5a97'
+    image: 'index.docker.io/sourcegraph/postgres-12-alpine:135107_2022-03-03_9498a8bd3366@sha256:e26b159dc7c0c47d136886390c899816e669a3c2c1ead689bdad0b610364e45e'
     cpus: 4
     mem_limit: '2g'
     healthcheck:

docker-compose/docker-compose.yaml

@@ -538,7 +538,7 @@ services:
   #
   pgsql:
     container_name: pgsql
-    image: 'index.docker.io/sourcegraph/postgres-12.6-alpine:insiders@sha256:83b7a1d85e2c0a9df0fd0cfecef1a184e648ee7f274d9d26cbd8a86171c66b6a'
+    image: 'index.docker.io/sourcegraph/postgres-12-alpine:135107_2022-03-03_9498a8bd3366@sha256:e26b159dc7c0c47d136886390c899816e669a3c2c1ead689bdad0b610364e45e'
     cpus: 4
     mem_limit: '2g'
     healthcheck:

pure-docker/deploy-pgsql.sh

@@ -19,7 +19,7 @@ docker run --detach \
     --memory=2g \
     -e PGDATA=/var/lib/postgresql/data/pgdata \
     -v $VOLUME:/var/lib/postgresql/data/ \
-    index.docker.io/sourcegraph/postgres-12.6-alpine:3.36.3@sha256:8a07418646c33d74e749391da3470f37d5401edae588bb79655f8c7206257d49
+    index.docker.io/sourcegraph/postgres-12-alpine:135107_2022-03-03_9498a8bd3366@sha256:e26b159dc7c0c47d136886390c899816e669a3c2c1ead689bdad0b610364e45e
 
 # Sourcegraph requires PostgreSQL 12+. Generally newer versions are better,
 # but anything 12 and higher is supported.