CI: add ~/.local/bin to PATH (Linux only)

Without adding ~/.local/bin to PATH, `pip install` will throw
an error when running inside a container.
Containers will be introduced to the CI in the following commits.

Signed-off-by: Oliver Steffen <osteffen@redhat.com>
Reviewed-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chris Fernald <chfernal@microsoft.com>

.azurepipelines/templates/platform-build-run-steps.yml

@@ -39,6 +39,12 @@ parameters:
   default: ''
 
 steps:
+- bash: |
+    echo "##vso[task.prependpath]${HOME}/.local/bin"
+    echo "new PATH=${PATH}"
+  displayName: Set PATH
+  condition: eq('${{ parameters.tool_chain_tag }}', 'GCC5')
+
 - checkout: self
   clean: true
   fetchDepth: 1

.azurepipelines/templates/pr-gate-steps.yml

@@ -16,6 +16,12 @@ parameters:
   extra_install_step: []
 
 steps:
+- bash: |
+    echo "##vso[task.prependpath]${HOME}/.local/bin"
+    echo "new PATH=${PATH}"
+  displayName: Set PATH
+  condition: eq('${{ parameters.tool_chain_tag }}', 'GCC5')
+
 - checkout: self
   clean: true
   fetchDepth: 1