Rewrote license activation to use a lock to prevent race-conditions.

unity-command/action.yaml

@@ -57,18 +57,19 @@ runs:
       version: ${{ inputs.version }}
       platform: ${{ inputs.platform }}
   - name: "Pull Unity container."
+    id: lock
     run: |
+      LOCK_NAME="unity-lock:unity-lock"
+      echo "lockName=$LOCK_NAME" >> "$GITHUB_OUTPUT"
+
+      # Acquire Docker lock for exclusive access to retag the static image
+      bash ${{ github.action_path }}/acquire_lock.sh "$LOCK_NAME"
+
+      IMAGE_TAG="${{ inputs.imageTag }}"
       CONTAINER="${{ steps.getContainer.outputs.container }}"
-
-      CACHED_CONTAINER="$CONTAINER-activated"
-      # Activate the license on build.
-      # DOCKER_BUILDKIT=1 \
-      # SERIAL="${{ inputs.serial }}" USERNAME="${{ inputs.email }}" PASSWORD="${{ inputs.password }}" \
-      # docker build --secret id=SERIAL,env=SERIAL --secret id=USERNAME,env=USERNAME --secret id=PASSWORD,env=PASSWORD \
-      # -t $CACHED_CONTAINER --build-arg IMAGE=$CONTAINER ${{ github.action_path }}
-      docker build -t $CACHED_CONTAINER --build-arg IMAGE=$CONTAINER ${{ github.action_path }}
-
-      docker tag $CACHED_CONTAINER ${{ inputs.imageTag }}
+      CACHED_CONTAINER="$CONTAINER-cached"
+      docker build -t "$CACHED_CONTAINER" --build-arg IMAGE="$CONTAINER" ${{ github.action_path }}
+      docker tag "$CACHED_CONTAINER" "$IMAGE_TAG"
     shell: bash
   - name: "Get Unity Command."
     id: command
@@ -87,6 +88,7 @@ runs:
       SSH_PUBLIC_KEY: ${{ inputs.sshPublicKey }}
       SSH_PRIVATE_KEY: ${{ inputs.sshPrivateKey }}
       CATCH_ERRORS: ${{ inputs.catchErrors }}
+      LOCK_NAME: ${{ steps.lock.outputs.lockName }}
     with:
       serial: ${{ inputs.serial }}
       # serial: "activated"
@@ -94,4 +96,11 @@ runs:
       password: ${{ inputs.password }}
       command: ${{ steps.command.outputs.command }}
       unityBuilder: ${{ inputs.unityBuilder }}
+  - name: "Release Unity Docker lock."
+    if: ${{ always() }}
+    run: |
+      LOCK_NAME="${{ steps.lock.outputs.lockName }}"
+      echo "Releasing Docker lock '$LOCK_NAME'..."
+      docker rmi "$LOCK_NAME" >/dev/null 2>&1 || true
+    shell: bash