Revert extraction of reusable workflow for tool installation

The tools are not available to the calling workflows.

Build artifacts are an option, but not sure how to get them right in the case of Python.

.github/workflows/build-data-archive.yml

@@ -12,9 +12,6 @@ on:
   workflow_dispatch:
 
 jobs:
-  install-tools:
-    uses: ./.github/workflows/install-tools.yml
-
   build:
     # Grant `GITHUB_TOKEN` the necessary permissions.
     permissions:
@@ -26,6 +23,16 @@ jobs:
       - name: Check out repository
         uses: actions/checkout@v4
 
+      - name: Install just
+        run: |
+          wget -q -O - 'https://github.com/casey/just/releases/download/1.38.0/just-1.38.0-x86_64-unknown-linux-musl.tar.gz' | tar xvz just --to-stdout > /usr/local/bin/just
+          chmod u+x /usr/local/bin/just
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - name: Fetch contributors
         run: just fetch-contributors
 

.github/workflows/validate.yml

@@ -10,21 +10,41 @@ on:
   workflow_dispatch:
 
 jobs:
-  install-tools:
-    uses: ./.github/workflows/install-tools.yml
-
   build:
     runs-on: ubuntu-latest
 
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
 
+      - name: Install just
+        run: |
+          wget -q -O - 'https://github.com/casey/just/releases/download/1.38.0/just-1.38.0-x86_64-unknown-linux-musl.tar.gz' | tar xvz just --to-stdout > /usr/local/bin/just
+          chmod u+x /usr/local/bin/just
+
+      - name: Setup cache for Taplo CLI executable
+        id: cache-taplo
+        uses: actions/cache@v4
+        with:
+          path: /usr/local/bin/taplo
+          key: taplo-0.9.3
+
+      - name: Install Taplo CLI
+        if: steps.cache-taplo.outputs.cache-hit != 'true'
+        run: |
+          wget -q -O - 'https://github.com/tamasfe/taplo/releases/download/0.9.3/taplo-linux-x86_64.gz' | gunzip -c > /usr/local/bin/taplo
+          chmod u+x /usr/local/bin/taplo
+
       - name: Validate party series TOML file
         run: just validate-series
 
       - name: Validate party TOML files
         run: just validate-parties
 
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - name: Ensure that parties are in the past
         run: just validate-party-dates