Add docker build and push

Add github workflow to run a docker build and push

update error message copy

Author: featheredtoast

.github/workflows/build.yml

@@ -0,0 +1,26 @@
+on:
+  push:
+    paths-ignore:
+      - "*.md"
+      - "docker-compose.yml"
+      - "**.md"
+      - "**.gitignore"
+
+env:
+  BUILDKIT_PROGRESS: plain
+
+jobs:
+  push:
+    if: (github.ref == 'refs/heads/main')
+    environment: docker push
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: [13, 14, 15, 16, 17]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - name: build images
+        run: |
+          docker login --username ${{ vars.DOCKERHUB_USERNAME }} --password ${{ secrets.DOCKER_PASSWORD }}
+          docker buildx build --push --platform linux/amd64,linux/arm64 --tag featheredtoast/discourse-postgres:${{ matrix.version }} --build-arg VERSION=${{ matrix.version }} .

run-postgres.sh

@@ -2,7 +2,7 @@
 set -Ee
 
 if [ -z "$DB_PASSWORD" ]; then
-    echo "DB_PASSWORD not set."
+    echo "Error: DB_PASSWORD not set."
     exit 1
 fi
 # Generate a password if one is not provided