chore: improve gomplate download failure diagnostics

Agent-Logs-Url: https://github.com/PandasWhoCode/initialize-github-job/sessions/e31e712d-aee7-47d1-b74d-57c36f48b802

Co-authored-by: andrewb1269 <184121471+andrewb1269@users.noreply.github.com>

Author: Copilot

README.md

@@ -113,7 +113,10 @@ Common steps for initializing a job for GitHub actions. This composite action co
 
 | Input          | Description              | Required | Default |
 |----------------|--------------------------|----------|---------|
-| setup-gomplate | Whether to setup gomplate | No       | -       |
+| setup-gomplate | Whether to setup gomplate | No       | false   |
+
+> [!NOTE]
+> `setup-gomplate` currently installs the Linux AMD64 gomplate release artifact.
 
 ### Outputs
 

action.yml

@@ -411,11 +411,19 @@ runs:
       if: ${{ inputs.setup-gomplate == 'true' }}
       shell: bash
       run: |
-        curl -sSfL "https://github.com/hairyhenderson/gomplate/releases/download/v5.0.0/gomplate_linux-amd64" \
-          -o /tmp/gomplate
-        curl -sSfL "https://github.com/hairyhenderson/gomplate/releases/download/v5.0.0/checksums-v5.0.0_sha256.txt" \
-          -o /tmp/gomplate_checksums.txt
-        echo "$(grep 'bin/gomplate_linux-amd64$' /tmp/gomplate_checksums.txt | awk '{print $1}')  /tmp/gomplate" | sha256sum -c -
+        GOMPLATE_VERSION="v5.0.0"
+        GOMPLATE_RELEASE_URL="https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}"
+
+        curl -sSfL "${GOMPLATE_RELEASE_URL}/gomplate_linux-amd64" \
+          -o /tmp/gomplate || { echo "Failed to download gomplate binary"; exit 1; }
+        curl -sSfL "${GOMPLATE_RELEASE_URL}/checksums-${GOMPLATE_VERSION}_sha256.txt" \
+          -o /tmp/gomplate_checksums.txt || { echo "Failed to download gomplate checksums"; exit 1; }
+        EXPECTED_SHA="$(grep 'bin/gomplate_linux-amd64$' /tmp/gomplate_checksums.txt | awk '{print $1}')"
+        if [ -z "${EXPECTED_SHA}" ]; then
+          echo "Unable to find checksum for gomplate_linux-amd64"
+          exit 1
+        fi
+        echo "${EXPECTED_SHA}  /tmp/gomplate" | sha256sum -c - || { echo "Gomplate checksum verification failed"; exit 1; }
         sudo install -m 755 /tmp/gomplate /usr/local/bin/gomplate
 
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