revert(#8893): Revert adding wal2json dev image (#8908)

Turns out that the standard `pgoutput` plugin shipped with Postgres will
do everything we need it to, and there are good examples of prior art
decoding its binary output in Elixir (in production).

So to avoid adding a dependency on `wal2json` here, we'll go with that.

.github/workflows/_elixir.yml

@@ -16,7 +16,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     services:
       postgres:
-        image: us-east1-docker.pkg.dev/firezone-staging/firezone/postgres:15
+        image: postgres:15
         ports:
           - 5432:5432
         env:
@@ -131,7 +131,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     services:
       postgres:
-        image: us-east1-docker.pkg.dev/firezone-staging/firezone/postgres:15
+        image: postgres:15
         ports:
           - 5432:5432
         env:
@@ -185,7 +185,7 @@ jobs:
         MIX_TEST_PARTITION: [1]
     services:
       postgres:
-        image: us-east1-docker.pkg.dev/firezone-staging/firezone/postgres:15
+        image: postgres:15
         ports:
           - 5432:5432
         env:

.github/workflows/build-postgres.yml

@@ -1,36 +0,0 @@
-name: Build Postgres
-
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 0 * * *"
-
-permissions:
-  id-token: write
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0
-      - uses: ./.github/actions/gcp-docker-login
-        id: login
-        with:
-          project: firezone-staging
-      - name: Build and push
-        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v6.15.0
-        with:
-          context: elixir
-          file: elixir/Dockerfile.postgres-dev
-          platforms: |
-            linux/amd64
-            linux/arm64
-          push: true
-          tags: |
-            ${{ steps.login.outputs.registry }}/firezone/postgres:latest
-            ${{ steps.login.outputs.registry }}/firezone/postgres:${{ github.sha }}
-            ${{ steps.login.outputs.registry }}/firezone/postgres:15

docker-compose.yml

@@ -2,8 +2,7 @@ services:
   # Dependencies
   postgres:
     # TODO: Enable pgaudit on dev instance. See https://github.com/pgaudit/pgaudit/issues/44#issuecomment-455090262
-    # Includes wal2json
-    image: us-east1-docker.pkg.dev/firezone-staging/firezone/postgres:15
+    image: postgres:15
     command: ["postgres", "-c", "wal_level=logical"]
     volumes:
       - postgres-data:/var/lib/postgresql/data

elixir/Dockerfile.postgres-dev

@@ -1,19 +0,0 @@
-# Builds a Postgres image with needed extensions and modules for local development
-
-# Install wal2json
-ARG POSTGRES_VERSION=15
-FROM postgres:${POSTGRES_VERSION}-alpine AS builder
-RUN apk add --no-cache \
-  build-base \
-  git \
-  llvm \
-  clang \
-  curl
-ARG WAL2JSON_VERSION=2_6
-RUN curl -fssL https://github.com/eulerto/wal2json/archive/refs/tags/wal2json_${WAL2JSON_VERSION}.tar.gz | tar -xzf - -C /tmp --strip-components=1
-WORKDIR /tmp
-RUN USE_PGXS=1 make && make install
-
-# Prepare final image
-FROM postgres:${POSTGRES_VERSION}-alpine
-COPY --from=builder /tmp/wal2json.so /usr/local/lib/postgresql/