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.gitea/workflows/build-image.yml

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+name: Build and Push Image
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set image variables
+        id: vars
+        env:
+          REGISTRY_URL: ${{ secrets.REGISTRY_URL }}
+        run: |
+          set -euo pipefail
+          REGISTRY_HOST="${REGISTRY_URL#https://}"
+          REGISTRY_HOST="${REGISTRY_HOST#http://}"
+          REPO_NAME="${GITHUB_REPOSITORY##*/}"
+          if [ -z "$REPO_NAME" ]; then
+            REPO_NAME="$(basename "$PWD")"
+          fi
+          TERRARIA_VERSION="$(awk -F= '/^ARG T_VERSION=/{print $2; exit}' Dockerfile)"
+          if [ -z "$TERRARIA_VERSION" ]; then
+            echo "T_VERSION not found in Dockerfile" >&2
+            exit 1
+          fi
+          echo "registry_host=$REGISTRY_HOST" >> "$GITHUB_OUTPUT"
+          echo "image=$REGISTRY_HOST/$REPO_NAME" >> "$GITHUB_OUTPUT"
+          echo "terraria_version=$TERRARIA_VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ steps.vars.outputs.registry_host }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ steps.vars.outputs.image }}
+          tags: |
+            type=sha
+            type=raw,value=latest
+            type=raw,value=${{ steps.vars.outputs.terraria_version }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}