add postgres build

.github/workflows/postgres.yaml

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+# TODO: This is less than ideal, but good familiarisation task
+# to replace
+name: Build Arches PostGIS
+run-name: Build Arches PostGIS
+on: [push]
+env:
+  ARCHES_BASE: flaxandteal/arches-postgis
+  ARCHES_VERSION: "7.5-dev"
+  REGISTRY: ghcr.io
+jobs:
+  Build-Arches:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - name: Set up Docker Context for Buildx
+        id: buildx-context
+        run: |
+          docker context create builders
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+          endpoint: builders
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.ARCHES_BASE }}-${{ env.ARCHES_VERSION }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            ARCHES_BASE=${{ env.ARCHES_BASE }}

Dockerfile.postgres

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+FROM kartoza/postgis:12.0
+COPY arches/install/init-unix.sql /docker-entrypoint-initdb.d/init.sql