Add deprecation warnings to all reusable workflows

Author: drewcassidy

.github/workflows/build.yml

@@ -39,6 +39,7 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     steps:
+      - run: echo "::warning:: Due to the inability to properly pin them, reusable workflows in KSPBuildTools will be deprecated in the next major version"
       - name: Checkout Mod Repo
         uses: actions/checkout@v4
         with:

.github/workflows/create-release.yml

@@ -58,6 +58,8 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     steps:
+      - run: echo "::warning:: Due to the inability to properly pin them, reusable workflows in KSPBuildTools will be deprecated in the next major version"
+
       - name: Checkout Mod Repo
         uses: actions/checkout@v4
         with:

.github/workflows/publish-to-spacedock.yml

@@ -29,6 +29,8 @@ jobs:
   publish-to-spacedock:
     runs-on: ubuntu-24.04
     steps:
+      - run: echo "::warning:: Due to the inability to properly pin them, reusable workflows in KSPBuildTools will be deprecated in the next major version"
+
       - name: get-release-info
         id: get-release-info
         uses: KSPModdingLibs/KSPBuildTools/.github/actions/get-release-info@main

.github/workflows/validate.yml

@@ -8,6 +8,8 @@ jobs:
   validate:
     runs-on: ubuntu-24.04
     steps:
+      - run: echo "::warning:: Due to the inability to properly pin them, reusable workflows in KSPBuildTools will be deprecated in the next major version"
+
       - name: Checkout repo
         uses: actions/checkout@v4