Always pass "+toolchain" to cargo or cross

I don't think this was actually using the specified toolchain, at least not
when cross compiling.

Changes.md

@@ -1,3 +1,10 @@
+## 0.0.7 - 2023-04-21
+
+- The toolchain argument was (probably) not being respected with cross builds,
+  though it's hard to be sure since none of the output from past CI runs I've
+  looked at it includes the toolchain version in the output. But now the
+  toolchain version is explicitly passed to all `cargo` and `cross` commands.
+
 ## 0.0.6 - 2023-04-21
 
 - When the `strip` parameter was true, stripping binaries could fail if there

action.yml

@@ -44,7 +44,6 @@ runs:
       with:
         targets: ${{ inputs.target }}
         toolchain: ${{ inputs.toolchain }}
-      if: ${{ steps.determine-cross-compile.outputs.needs-cross == 'false' }}
     - name: Install cross if cross-compiling (*nix)
       shell: bash
       run: install-cross-nix.sh
@@ -64,7 +63,7 @@ runs:
     - name: Run tests (*nix)
       shell: bash
       run: |
-        ${{ steps.set-build-command.outputs.build-command }} test ${{ inputs.args }} --target ${{ inputs.target }}
+        ${{ steps.set-build-command.outputs.build-command }} +${{inputs.toolchain}} test ${{ inputs.args }} --target ${{ inputs.target }}
       if: ${{ inputs.command != 'build' && runner.os != 'Windows' }}
     # We want to run in Powershell on Windows to make sure we compile in a
     # native Windows environment. Some things won't compile properly under
@@ -73,17 +72,17 @@ runs:
     - name: Run tests (Windows)
       shell: powershell
       run: |
-        & ${{ steps.set-build-command.outputs.build-command }} test ${{ inputs.args }} --target ${{ inputs.target }}
+        & ${{ steps.set-build-command.outputs.build-command }} +${{inputs.toolchain}} test ${{ inputs.args }} --target ${{ inputs.target }}
       if: ${{ inputs.command != 'build' && runner.os == 'Windows' }}
     - name: Build binary (*nix)
       shell: bash
       run: |
-        ${{ steps.set-build-command.outputs.build-command }} build ${{ inputs.args }} --target ${{ inputs.target }}
+        ${{ steps.set-build-command.outputs.build-command }} +${{inputs.toolchain}} build ${{ inputs.args }} --target ${{ inputs.target }}
       if: ${{ inputs.command != 'test' && runner.os != 'Windows' }}
     - name: Build binary (Windows)
       shell: powershell
       run: |
-        & ${{ steps.set-build-command.outputs.build-command }} build ${{ inputs.args }} --target ${{ inputs.target }}
+        & ${{ steps.set-build-command.outputs.build-command }} +${{inputs.toolchain}} build ${{ inputs.args }} --target ${{ inputs.target }}
       if: ${{ inputs.command != 'test' && runner.os == 'Windows' }}
     - name: Strip binary
       shell: bash