Merge #6892: guix: adjust scripts to use SDK_SOURCES env variable properly

7d3e909 guix: adjust scripts to use `SDK_SOURCES` env variable properly (UdjinM6)

Pull request description:

  ## Issue being fixed or feature implemented
  #6890 (review)

  ## What was done?

  ## How Has This Been Tested?

  ## Breaking Changes

  ## Checklist:
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [ ] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  kwvg:
    utACK 7d3e909
  kwvg:
    utACK 7d3e909

Tree-SHA512: 3b69c34ad85ae946c58789a9fad37804db66b82e602434de8df15b3f47e6663d2ad4a65e763ae67a066a6b4d796899b588582939906f400fac543c917abd0f66

Author: PastaPastaPasta

contrib/containers/guix/scripts/guix-start

@@ -11,7 +11,7 @@ fi
 
 if [[ -z "${HOSTS}" || "${HOSTS}" == *"darwin"* ]]; then
     export SDK_PATH="${SDK_PATH:-${WORKSPACE_PATH}/depends/SDKs}"
-    export SDK_SRCS="${SDK_PATH:-${WORKSPACE_PATH}/depends/sdk-sources}"
+    export SDK_SOURCES="${SDK_SOURCES:-${WORKSPACE_PATH}/depends/sdk-sources}"
 
     ./contrib/containers/guix/scripts/setup-sdk
 fi

contrib/containers/guix/scripts/setup-sdk

@@ -9,16 +9,16 @@ set -eo pipefail
 
 SDK_URL="${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}"
 SDK_PATH="${SDK_PATH:-depends/SDKs}"
-SDK_SRCS="${SDK_SOURCES:-depends/sdk-sources}"
+SDK_SOURCES="${SDK_SOURCES:-depends/sdk-sources}"
 XCODE_VERSION="${XCODE_VERSION:-15.0}"
 XCODE_RELEASE="${XCODE_RELEASE:-15A240d}"
 XCODE_ARCHIVE="Xcode-${XCODE_VERSION}-${XCODE_RELEASE}-extracted-SDK-with-libcxx-headers"
-XCODE_AR_PATH="${SDK_SRCS}/${XCODE_ARCHIVE}.tar.gz"
+XCODE_AR_PATH="${SDK_SOURCES}/${XCODE_ARCHIVE}.tar.gz"
 
 if [ ! -d "${SDK_PATH}/${XCODE_ARCHIVE}" ]; then
     if [ ! -f "${XCODE_AR_PATH}" ]; then
         echo "Downloading macOS SDK..."
-        mkdir -p "${SDK_SRCS}"
+        mkdir -p "${SDK_SOURCES}"
         curl --location --fail "${SDK_URL}/${XCODE_ARCHIVE}.tar.gz" -o "${XCODE_AR_PATH}"
     fi
     echo "Extracting macOS SDK..."