feat: Update release process to skip Docker Hub login if credentials …

.github/workflows/release.yml

@@ -214,8 +214,28 @@ jobs:
       - name: Log in to GHCR
         run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin
 
+      # Docker Hub is optional. GHCR needs no configuration, so a missing Docker Hub secret
+      # must not fail a release that otherwise succeeded.
       - name: Log in to Docker Hub
-        run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login docker.io -u "${{ secrets.DOCKERHUB_USERNAME }}" --password-stdin
+        shell: bash
+        env:
+          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          if [[ -z "${DOCKERHUB_USERNAME:-}" || -z "${DOCKERHUB_TOKEN:-}" ]]; then
+            echo "DOCKERHUB_USERNAME or DOCKERHUB_TOKEN is not set; publishing to GHCR only." >&2
+            echo "DOCKERHUB_ENABLED=false" >> "$GITHUB_ENV"
+            {
+              echo "### Docker Hub"
+              echo ""
+              echo "Skipped — \`DOCKERHUB_USERNAME\` / \`DOCKERHUB_TOKEN\` are not configured."
+              echo "The image was published to GHCR only."
+            } >> "$GITHUB_STEP_SUMMARY"
+            exit 0
+          fi
+          echo "$DOCKERHUB_TOKEN" | docker login docker.io -u "$DOCKERHUB_USERNAME" --password-stdin
+          echo "DOCKERHUB_ENABLED=true" >> "$GITHUB_ENV"
 
       - name: Build and push
         shell: bash
@@ -224,14 +244,15 @@ jobs:
         run: |
           set -euo pipefail
           MAJOR_MINOR="${VERSION%.*}"
-          docker build \
-            --build-arg VERSION="$VERSION" \
-            -t "$IMAGE_GHCR:$VERSION" \
-            -t "$IMAGE_GHCR:$MAJOR_MINOR" \
-            -t "$IMAGE_GHCR:latest" \
-            -t "$IMAGE_DOCKERHUB:$VERSION" \
-            -t "$IMAGE_DOCKERHUB:$MAJOR_MINOR" \
-            -t "$IMAGE_DOCKERHUB:latest" \
-            .
+
+          TAGS=(-t "$IMAGE_GHCR:$VERSION" -t "$IMAGE_GHCR:$MAJOR_MINOR" -t "$IMAGE_GHCR:latest")
+          if [[ "${DOCKERHUB_ENABLED:-false}" == "true" ]]; then
+            TAGS+=(-t "$IMAGE_DOCKERHUB:$VERSION" -t "$IMAGE_DOCKERHUB:$MAJOR_MINOR" -t "$IMAGE_DOCKERHUB:latest")
+          fi
+
+          docker build --build-arg VERSION="$VERSION" "${TAGS[@]}" .
+
           docker push --all-tags "$IMAGE_GHCR"
-          docker push --all-tags "$IMAGE_DOCKERHUB"
+          if [[ "${DOCKERHUB_ENABLED:-false}" == "true" ]]; then
+            docker push --all-tags "$IMAGE_DOCKERHUB"
+          fi

CHANGELOG.md

@@ -10,6 +10,15 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [1.0.2] - 2026-07-31
+
+### Fixed
+
+- A missing `DOCKERHUB_USERNAME` / `DOCKERHUB_TOKEN` no longer fails the release. The 1.0.1 run
+  published the tag, the zip and the GHCR image correctly, then went red on
+  `docker login docker.io -u ""`. Docker Hub is now skipped with a note in the run summary when
+  it is not configured, and the image still goes to GHCR.
+
 ## [1.0.1] - 2026-07-31
 
 ### Changed
@@ -110,6 +119,7 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - Every pull request runs `dotnet list package --vulnerable --include-transitive` and fails on a
   hit. CLI output is forced to English so the check cannot silently pass on a localised runner.
 
-[Unreleased]: https://github.com/Mysttic/TargetApiSimulator/compare/v1.0.1...HEAD
+[Unreleased]: https://github.com/Mysttic/TargetApiSimulator/compare/v1.0.2...HEAD
+[1.0.2]: https://github.com/Mysttic/TargetApiSimulator/compare/v1.0.1...v1.0.2
 [1.0.1]: https://github.com/Mysttic/TargetApiSimulator/compare/v1.0.0...v1.0.1
 [1.0.0]: https://github.com/Mysttic/TargetApiSimulator/releases/tag/v1.0.0

CONTRIBUTING.md

@@ -86,6 +86,19 @@ source, but it requires an application and approval, and the signature is issued
 foundation's name rather than the project's. Everything this project publishes stays on
 GitHub — no external package registry or account is involved.
 
+### Repository secrets
+
+Only one thing is configurable, and it is optional:
+
+| Secret | Purpose |
+|---|---|
+| `DOCKERHUB_USERNAME` | Docker Hub account name, lowercase — `mysttic`, not an email address. Has to match the `docker.io/<namespace>/targetapisimulator` namespace. |
+| `DOCKERHUB_TOKEN` | A Docker Hub personal access token with **Read & Write** scope, from Account settings → Personal access tokens. Not the account password; with 2FA enabled a password cannot work anyway. |
+
+If either is missing the release still succeeds and the image is published to GHCR only, with a
+note in the run summary. GHCR needs no secret — it authenticates with the built-in
+`GITHUB_TOKEN`.
+
 ### Dry run
 
 `release.yml` can be started manually from the Actions tab. A `workflow_dispatch` run builds and

VERSION.md

@@ -1,6 +1,6 @@
 # Version
 
-1.0.1
+1.0.2
 
 <!--
   This file is the single source of truth for the released version.