Add IdentityServer Docker image workflow

.github/workflows/docker-image.yml

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+name: Docker image - IdentityServer
+
+on:
+  push:
+    branches:
+      - develop
+      - main
+    paths:
+      - src/**
+      - .github/workflows/docker-image.yml
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+    branches:
+      - develop
+      - main
+    paths:
+      - src/**
+      - .github/workflows/docker-image.yml
+  workflow_dispatch:
+    inputs:
+      push_image:
+        description: Push the image to Docker Hub.
+        required: false
+        default: false
+        type: boolean
+      custom_tag:
+        description: Optional extra tag for a manual publication.
+        required: false
+        default: ''
+        type: string
+
+permissions:
+  contents: read
+
+concurrency:
+  group: docker-identityserver-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  build:
+    name: Build IdentityServer image
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+
+    steps:
+      - name: Check out source
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Validate build inputs
+        shell: bash
+        env:
+          BUILD_CONTEXT: ./src
+          DOCKERFILE: ./src/SenseNet.IdentityServer4.Web/Dockerfile
+        run: |
+          set -euo pipefail
+
+          test -d "${BUILD_CONTEXT}" || {
+            echo "::error::Docker context does not exist: ${BUILD_CONTEXT}"
+            exit 1
+          }
+          test -f "${DOCKERFILE}" || {
+            echo "::error::Dockerfile does not exist: ${DOCKERFILE}"
+            exit 1
+          }
+
+      - name: Resolve source version
+        id: source
+        shell: bash
+        env:
+          BRANCH_TAG: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.pull_request.number) || github.ref_name }}
+        run: |
+          set -euo pipefail
+
+          SOURCE_SHA="$(git rev-parse HEAD)"
+          SHORT_SHA="$(git rev-parse --short=8 HEAD)"
+          COMMIT_DATE="$(git show -s --format=%cd --date=format:%Y%m%d HEAD)"
+          VERSION_TAG="${COMMIT_DATE}-${SHORT_SHA}"
+          LEGACY_DATE="$(TZ=Europe/Budapest date +%Y.%m.%d)"
+
+          case "${BRANCH_TAG}" in
+            main)
+              COMPATIBILITY_TAG="${LEGACY_DATE}"
+              ;;
+            *)
+              COMPATIBILITY_TAG="${BRANCH_TAG}.${LEGACY_DATE}"
+              ;;
+          esac
+
+          echo "source_sha=${SOURCE_SHA}" >> "${GITHUB_OUTPUT}"
+          echo "branch_tag=${BRANCH_TAG}" >> "${GITHUB_OUTPUT}"
+          echo "version_tag=${VERSION_TAG}" >> "${GITHUB_OUTPUT}"
+          echo "compatibility_tag=${COMPATIBILITY_TAG}" >> "${GITHUB_OUTPUT}"
+
+      - name: Set up Docker metadata
+        id: meta
+        uses: docker/metadata-action@v6
+        with:
+          images: sensenetcsp/sn-identityserver
+          tags: |
+            type=raw,value=${{ steps.source.outputs.branch_tag }}
+            type=raw,value=${{ steps.source.outputs.compatibility_tag }}
+            type=raw,value=${{ steps.source.outputs.version_tag }}
+            type=raw,value=preview,enable=${{ github.event_name == 'push' && github.ref_name == 'develop' }}
+            type=raw,value=latest,enable=${{ github.event_name == 'push' && github.ref_name == 'main' }}
+            type=raw,value=${{ inputs.custom_tag }},enable=${{ github.event_name == 'workflow_dispatch' && inputs.custom_tag != '' }}
+          labels: |
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ steps.source.outputs.source_sha }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Log in to Docker Hub
+        if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && inputs.push_image)
+        uses: docker/login-action@v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and optionally push
+        uses: docker/build-push-action@v7
+        with:
+          context: ./src
+          file: ./src/SenseNet.IdentityServer4.Web/Dockerfile
+          platforms: linux/amd64
+          push: ${{ github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && inputs.push_image) }}
+          pull: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha,scope=identityserver
+          cache-to: type=gha,mode=max,scope=identityserver

docs/docker-image-workflow.md

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+# Docker image workflow
+
+The repository-owned `docker-image.yml` workflow builds the IdentityServer
+image from `src/SenseNet.IdentityServer4.Web/Dockerfile` with `src` as the
+Docker build context. It publishes `sensenetcsp/sn-identityserver` to Docker
+Hub.
+
+Pushes to `develop` and `main` build and publish automatically. Pull requests
+targeting either branch perform build-only validation and never log in or push.
+Manual runs use the branch selected in GitHub's **Run workflow** dialog and do
+not publish unless `push_image` is enabled.
+
+Published images receive the source branch tag, an immutable
+`YYYYMMDD-shortSHA` tag, and the legacy TFS-compatible date tag:
+
+- `develop.YYYY.MM.DD` on `develop`;
+- `YYYY.MM.DD` on `main`.
+
+Automatic `develop` publishes also update `preview`, while automatic `main`
+publishes update `latest`. A manual publishing run may add a `custom_tag`.
+
+The workflow requires these repository secrets for publishing:
+
+- `DOCKERHUB_USERNAME`
+- `DOCKERHUB_TOKEN`
+
+TFS definition 348 downloads the `Sn-Deployment` artifact only for generic
+Docker build, tag, login, push, logout, and runner-cleanup scripts. Its active
+IdentityServer build is a plain Docker build with this repository's Dockerfile
+and `src` context; it has no active private-feed preparation or generated build
+asset that must be reproduced here.
+
+The current Dockerfile's Node 14 installation was validated by a full pushless
+build. The deleted `hotfix/node-version-in-dockerfile` remote branch contained
+the same Node version and checksum already present on `develop`, so it is not
+part of this migration.