CI: require the OsPath build flag in the build-flags check

.github/workflows/build-macos-arm64.yaml

@@ -239,7 +239,7 @@ jobs:
         run: |
           # apparently order is not alphabetic, so cannot be relied upon for a single grep
           flags=$(git annex version | grep 'build flags:')
-          for f in Assistant MagicMime Servant S3; do
+          for f in Assistant MagicMime Servant S3 OsPath; do
             echo -n "Checking for $f: "
             echo "$flags" | grep --color "$f" || { echo "FAIL"; exit 1; }
           done

.github/workflows/build-macos.yaml

@@ -238,7 +238,7 @@ jobs:
         run: |
           # apparently order is not alphabetic, so cannot be relied upon for a single grep
           flags=$(git annex version | grep 'build flags:')
-          for f in Assistant MagicMime Servant S3; do
+          for f in Assistant MagicMime Servant S3 OsPath; do
             echo -n "Checking for $f: "
             echo "$flags" | grep --color "$f" || { echo "FAIL"; exit 1; }
           done

.github/workflows/build-ubuntu.yaml

@@ -279,7 +279,7 @@ jobs:
         run: |
           # apparently order is not alphabetic, so cannot be relied upon for a single grep
           flags=$(git annex version | grep 'build flags:')
-          for f in Assistant MagicMime Servant S3; do
+          for f in Assistant MagicMime Servant S3 OsPath; do
             echo -n "Checking for $f: "
             echo "$flags" | grep --color "$f" || { echo "FAIL"; exit 1; }
           done

.github/workflows/build-windows.yaml

@@ -261,7 +261,7 @@ jobs:
         run: |
           # apparently order is not alphabetic, so cannot be relied upon for a single grep
           flags=$(git annex version | grep 'build flags:')
-          for f in Assistant MagicMime Servant S3; do
+          for f in Assistant MagicMime Servant S3 OsPath; do
             echo -n "Checking for $f: "
             echo "$flags" | grep --color "$f" || { echo "FAIL"; exit 1; }
           done

.github/workflows/template/build-{{ostype}}.yaml.j2

@@ -456,7 +456,7 @@ jobs:
         run: |
           # apparently order is not alphabetic, so cannot be relied upon for a single grep
           flags=$(git annex version | grep 'build flags:')
-          for f in Assistant MagicMime Servant S3; do
+          for f in Assistant MagicMime Servant S3 OsPath; do
             echo -n "Checking for $f: "
             echo "$flags" | grep --color "$f" || { echo "FAIL"; exit 1; }
           done