ci: allow overriding script inputs from the environment

When testing out these scripts on a fork, I realized that it was more
convenient to use a single environment variable (e.g.,
`GITHUB_API_URL=... ci/draft-release.sh`) to change some of the script's
input parameters.

ci/download-workflow-artifacts.sh

@@ -10,10 +10,10 @@ set -e
 #
 # Usage: download-workflow-artifacts.sh <workflow run ID> <token>
 
-WORKFLOW_RUN_ID=$1
-GITHUB_TOKEN=$2
-GITHUB_API_VERSION=2022-11-28
-GITHUB_API_URL=https://api.github.com/repos/WebAssembly/wasi-sdk
+WORKFLOW_RUN_ID=${WORKFLOW_RUN_ID:-$1}
+GITHUB_TOKEN=${GITHUB_TOKEN:-$2}
+GITHUB_API_VERSION=${GITHUB_API_VERSION:-2022-11-28}
+GITHUB_API_URL=${GITHUB_API_URL:-https://api.github.com/repos/WebAssembly/wasi-sdk}
 TMP_DIR=$(mktemp -d -t wasi-sdk-artifacts.XXXXXXX)
 
 if [ -z "${WORKFLOW_RUN_ID}" ] || [ -z "${GITHUB_TOKEN}" ]; then

ci/draft-release.sh

@@ -12,11 +12,11 @@ set -e
 #
 # Usage: draft-release.sh <release tag> <artifacts dir> <token>
 
-TAG=$1
-ARTIFACTS_DIR=$2
-GITHUB_TOKEN=$3
-GITHUB_API_VERSION=2022-11-28
-GITHUB_API_URL=https://api.github.com/repos/WebAssembly/wasi-sdk
+TAG=${TAG:-$1}
+ARTIFACTS_DIR=${ARTIFACTS_DIR:-$2}
+GITHUB_TOKEN=${GITHUB_TOKEN:-$3}
+GITHUB_API_VERSION=${GITHUB_API_VERSION:-2022-11-28}
+GITHUB_API_URL=${GITHUB_API_URL:-https://api.github.com/repos/WebAssembly/wasi-sdk}
 TMP_DIR=$(mktemp -d -t release.sh.XXXXXXX)
 
 if [ -z "${TAG}" ] || [ -z "${ARTIFACTS_DIR}" ] || [ -z "${GITHUB_TOKEN}" ]; then

ci/get-workflows-for-tag.sh

@@ -10,10 +10,10 @@ set -e
 #
 # Usage: get-workflows-for-tag.sh <tag> <token>
 
-TAG=$1
-GITHUB_TOKEN=$2
-GITHUB_API_VERSION=2022-11-28
-GITHUB_API_URL=https://api.github.com/repos/WebAssembly/wasi-sdk
+TAG=${TAG:-$1}
+GITHUB_TOKEN=${GITHUB_TOKEN:-$2}
+GITHUB_API_VERSION=${GITHUB_API_VERSION:-2022-11-28}
+GITHUB_API_URL=${GITHUB_API_URL:-https://api.github.com/repos/WebAssembly/wasi-sdk}
 
 if [ -z "${TAG}" ] || [ -z "${GITHUB_TOKEN}" ]; then
     >&2 echo "Missing parameter; exiting..."

ci/is-workflow-valid.sh

@@ -13,11 +13,11 @@ set -e
 #
 # Usage: is-workflow-valid.sh <release tag> <workflow run ID> <token>
 
-TAG=$1
-WORKFLOW_RUN_ID=$2
-GITHUB_TOKEN=$3
-GITHUB_API_VERSION=2022-11-28
-GITHUB_API_URL=https://api.github.com/repos/WebAssembly/wasi-sdk
+TAG=${TAG:-$1}
+WORKFLOW_RUN_ID=${WORKFLOW_RUN_ID:-$2}
+GITHUB_TOKEN=${GITHUB_TOKEN:-$3}
+GITHUB_API_VERSION=${GITHUB_API_VERSION:-2022-11-28}
+GITHUB_API_URL=${GITHUB_API_URL:-https://api.github.com/repos/WebAssembly/wasi-sdk}
 
 if [ -z "${TAG}" ] || [ -z "${WORKFLOW_RUN_ID}" ] || [ -z "${GITHUB_TOKEN}" ]; then
     >&2 echo "Missing parameter; exiting..."